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8 Keys to Building an Awesome Fantasy Baseball Keeper League

So you’re thinking about starting a new fantasy baseball keeper league. Or maybe you have a keeper league and it’s starting to show some cracks and you want to bring it back to the sparkle of its youth. Well, there’s no better time than now to make it happen.

While we’re waiting on Spring Training to get here and some actual news to happen, it may allow us the perfect time to think about how we can create the perfect keeper league. So instead of reading those player profiles for the 50th time, let’s get to work and figure out how to make our keeper leagues better than they were before.

Ready to make the 2024 MLB season the best yet? Fantrax offers a fantasy baseball league for everyone. Want to get started right away? Then jump into a Best Ball League or a Draft and Hold. Maybe you have an existing league but want the most customizable fantasy baseball platform in existence? Then you definitely need to check out the Fantrax Commissioner! And of course, whether you play roto or points, you can head to the Fantrax Mock Draft Lobby to start your draft prep for the 2024 fantasy baseball season.

Building the Perfect Keeper League

Why a Keeper League?

Listen, Fantasy Baseball is awesome no matter how you like to play. I enjoy keeper leagues because you get the excitement and intensity of a pretty full draft day like in redraft leagues, but you also get to enjoy the long-term planning and forecasting that goes into a dynasty league. Keeper Leagues allow you to have the best of both worlds when it comes to fantasy baseball. They are not without their pitfalls though. In the next few paragraphs, we’ll talk about the ways you can make your keeper league a lasting one, avoiding the land mines along the way.

1. Finding the Right Managers

You can do everything I’m going to mention in the next few paragraphs and still have the league fall apart if you don’t get quality managers involved. This is the most important task you will have in starting a keeper league.

The temptation is to just send out blanket invites and take the first people who express interest. I urge you to be more discerning. Keeper leagues require a commitment. Allowing people in who just want to ‘try it out’ is a recipe for disaster. It may mean a lot more time and effort put into finding the right managers, but it will be worth it in the end.

Now I mention finding managers first because it is the most important task. It should not, however, be the first task you take on. Before you look for managers you need to nail down the basic rules and setup of your league. I’ve seen leagues where they found their 12 or 15 owners and then tried to haggle out the rules. It’s not impossible, but quite often you end up with owners playing in a league with rules they are not really on board with. That can lead to owners eventually moving on.

Instead figure out your roster size, scoring format, trading rules, and other details first. The league will work much better if you have owners who know the details ahead of time and believe in the basic setup of your keeper league. So read on for more ideas on the rules and format of the ideal keeper league. Just remember that the owners in your league are the key ingredients and everything will be much better if they fully buy into the rules and scoring. Nothing will work if you get this wrong.

2. Roto vs. Points

I’m a big believer in roto. I think the categories allow for a level of strategy that points leagues just can’t match. I relish the opportunity to organize my team in such a way that it maximizes the value within the statistical categories. In my opinion, the roto format brings out more of the gameplay and makes it more about the fantasy manager and not just the MLB players.

I’m also not a fan of Head-to-Head in general. As the cliche goes, baseball is a marathon, not a sprint. You should be rewarded for that marathon. There’s nothing worse than leading the league for the entire season and then losing out on a fluke week.

With all that said I realize, many people disagree with me. The important thing is that the scoring is relatively simple and all owners are on board with it. There’s no right way to play fantasy baseball. Just make sure it works for you and the owners in your league.

3. Player Universe and League Size

I prefer NL- and AL-only formats or 15-team and deeper mixed leagues. I like the variation in the quality of players and believe the shallower player pool forces us to make tough decisions and challenges us much more as fantasy baseball managers. If you go with a mixed league format I certainly urge you to go with at least 15 teams. Deeper is better in my opinion. With shallower leagues, there’s not a lot of differentiation within the player pool. It takes away some of the knowledge and skill involved in managing a team in deeper formats.

Whether you go with an ‘Only’ or a mixed league, bringing prospects and minor leaguers into the equation is a must. We all love to find the next big thing! I think it also makes us better baseball fans when we expand our research to another level.

My basic take on the player universe is that the deeper you can go, the more you’ll take advantage of the joys a keeper league offers.

4. How Many Keepers?

Obviously, I can’t tell you what’s gonna work for you. I’ll share my thoughts and you can go from there. The leagues I’ve enjoyed the most have allowed owners to keep between eight and 12 active MLB players. This allows you to build a base of players you can build a team around, but it also lets you enjoy draft day to its fullest and reshape your team every year.

Limiting it to around 10 keepers also allows room for every owner to feel like they have a shot every year. Go much higher than that and the advantage some teams have will seem almost insurmountable. Of course, that’s fine. They earned it. It’s just getting closer to a dynasty format and we’re talking keeper leagues here.

In addition to those active MLB players, I also suggest a minor league roster of between four and six players. The research it takes to draft these prospects really makes you a better fan. It’s also nice when one of your prospects breaks out and you have a stud at a low price for four or five years.

5. Auction or Snake Draft

I strongly recommend acquiring players through an auction. I am a big believer in the game of fantasy baseball being about the people who play it, just as much as it’s about the MLB players the game is centered around. Auctions take our hobby to a new level you just can’t appreciate until you’ve experienced one. For more on succeeding in the auction format check out my Auction Strategy for 2023.

Whether you go with the auction or stick with a snake draft, I implore you to attach some form of cost to each player. The choice to keep a player shouldn’t just be about production. Attaching a cost to that production again forces decisions and allows for more use of strategy. It also helps in turning over the rosters and ensures star players won’t likely be kept for years on end.

6. Contract Length

Another important item in keeper leagues is how long one owner can retain a player. Owners should get rewarded for smart drafting, but at the same time, should they get to keep a player forever when they may have just gotten lucky? I’m a fan of a traditional three-year contract with the option of signing a player to an extension for an additional yearly salary. I think five years is about the limit that makes sense. Any longer and you’re getting into dynasty territory. My basic take is that we should get to enjoy a smart draft pick for a few years, but there has to be an additional cost that increases over time. Eventually, that player needs to be returned to the player pool.

7. Trading Rules in Keeper Leagues

If there’s one problem common to just about every keeper league it’s problems with the dreaded dump trades.

Dump trades involve one owner swapping out current value to another owner for potential future value. Dump trades usually involve prospects or low-priced players traded for high-priced studs. They make sense for both of the teams involved, but they can drastically change the standings within a keeper league in a hurry.

Many people want to ban dump trades altogether, but I think they are an integral part of any keeper league. First of all, I hate any rule that limits the ability of an owner to run their team the way they see fit. But an additional effect of dump trades is to ensure yearly turnover in the league standings. If you go for broke in the current year and trade away all your low-priced keepers, it makes it very hard to come back and compete the next season.

There is no doubt though that dump trades done wrong can ruin a league. My solution is the Dumping Proclamation. I write more about it here, but the idea is that before an owner can make a dump trade, they must post their intentions on the league message board. They then have to wait at least one full week before any dump trades can be executed. This lets everyone in the league know that the players involved are available. Owners don’t get quite so upset when they know they had the same opportunity as everyone else to deal for all that talent.

Once again the importance of common values among your owners is of the utmost importance. They need to know the policy on dump trades before joining the league and share a similar philosophy or there will be big problems ahead.

8. Where to Host Your Keeper League?

I have to admit I’m biased here. I work for Fantrax. If I go and tout some other league management system my bosses aren’t going to look at that with a smile. Luckily the Fantrax Fantasy Baseball Commissioner makes it really easy to promote. It is more customizable than any league manager I’ve ever seen. We just talked about issues like contract length, player pool, and salaries. All of these can be easily customized in a Fantrax league. If Fantrax can’t meet the needs of your league, no league management software can. Depending on the features you need for your league, Fantrax may even have a free option for your keeper league. If your league needs more than the basic features, Fantrax can handle anything you throw at it for a fraction of the cost of its competitors.

Final Word on Starting a Keeper League

Keeper leagues combine the positive aspects of redraft leagues and dynasty leagues, allowing both short-term and long-term enjoyment. If you’re reading this you probably already know that. The big takeaway here is that starting a keeper league should not be a spur-of-the-moment thing. The league needs to be planned out and the owners need to be carefully selected. The worst thing you can do is cobble together a bunch of people with different ideas on what a good keeper league should be. Replacing multiple owners every year takes all of the steam out of a keeper league and will eventually lead to its demise. Get it right though and your keeper league will provide years of enjoyment along with some of the best friends and foes you’ll ever meet.

For more of the great fantasy baseball rankings and analysis you’ve come to expect from FantraxHQ, check out our full 2024 Fantasy Baseball Draft Kit! We’re here for you all the way up until Opening Day and then on into your championship run.

Fantrax was one of the fastest-growing fantasy sites over the last few years, and we’re not stopping now. We are the most customizable, easy-to-use, and feature-rich platform in the industry, offering the greatest fantasy experience for your dynasty, keeper, redraft, and best ball leagues. Fantasy sports doesn’t sleep, and neither does Fantrax, with seasons running 365 days a year. Take your fantasy leagues to the next level now at!
  1. Ben Weber says

    Hey Doug,

    Do you have any advice on how keeper redrafts should be configured?

    I am heading into year 2 of a keeper league that can keep 22 of a max 32 mlb player roster.. you can also keep 10 minor leaguers that don’t count towards the mlb roster.. the league is H2H points and has a salary cap. I don’t know how to properly set up the draft to consider all keepers and also end when roster size is at max or a player can’t draft because they are over cap.. any ideas on how I could learn what the best way to set up my league is?

    1. Doug Anderson says

      Not sure where your league is hosted but Fantrax (and others) make it pretty easy to set up your auction that takes keepers into account. What I’ve done in the past is to run the MLB portion of the auction/draft on Fantrax and then just do the Minor League portion in the chat room.

  2. John G. says

    Hi Doug….appreciate your knowledge and information above. So I have been in a keeper league for about 5 years. Usually we have about 8-10 returning owners and 2 new owners annually. So the league size varies from 10-12, we may even have more this year. I have invited several of the “new” owners and have a friend joining this year. I am always concerned that the new owners do not have the same advantage as the “vets” since we get (in our league) 9 keepers. The salaries for keepers go up $2-5 every year, depending on their previous salary. But if you get someone early, you can keep them for like 7 years before it may no longer make sense. I give you all of that to ask…..should the new owners be allowed to tap into some of the better keeper values or should the returning owners be able to protect their 9 keepers before each season with new owners able to then take some keepers of their own based on the unprotected players? My thought is that maybe each team should be able to protect 5 or so players and then could lose maybe one of their intended keepers beyond that so the new owners can hit the ground running better. If it is limited to one potential lost player per team, the “hit” shoudl not be that great, IMHO. Thoughts? And again, thanks!

    1. Doug Anderson says

      A league I ran a few years back was in a very similar situation. It was a salary league so players had a specific value and contract lengths. We did basically what you are suggesting. Whereas in a normal year each manager got to keep 10 players, that year I think we bumped it down to 6 or 7 and the new managers had their own little expansion draft and chose players with their current contract situations. I have to say I got a lot more flack from existing owners than I thought I would, but I know I wouldn’t want to go into a league at that big of a disadvantage.

      One thing that might mitigate that in the future is if you have each pay a year ahead or maybe a 50% deposit. Then when they leave the league, the new manager gets some form of discount. Makes the pain of taking over a desolate team a little more bearable.

    2. Doug Anderson says

      Just thinking about what we did, I believe each existing manager initially got to protect 6, then we had the expansion draft. Then managers were allowed to keep more players if they had any remaining decent keepers.

      1. John G. says

        OK, great feedback, MUCH obliged. I always hope to finish in the money, as everyone does, but having fun is the priority for me and I think setting up a better “entryway” for new owners should benefit the league overall. I understand that some existing owners might feel that doing this is unfair (hence your flack, LOL!!) but really, the existing owners will STILL have a huge advantage…again, much appreciated! -JG

  3. David says

    Can you give a newbie some advice? I’m just entering the second year (first time ever keeping!) of my new keeper league after over a decade running redrafts.

    We’re playing a 14-team mixed league 5×5 but with OBP instead of AVG. Standard $260. Standard 23 active starters. Nine keepers allowed. I have it narrowed down to the following:
    $6 Javier Baez
    $1 Jesus Aguilar
    $4 Buster Posey
    $1 Shin-Soo Choo
    $1 Mike Foltynewicz
    $4 Mike Clevinger (yes, I only keep starting pitchers named Mike. I do have $21 Paxton and $28 Carrasco, but those are keeper values)
    $13 Eugenio Suraez

    It’s the next two that I’m torn about. Which two of these rounds out my nine?
    $28 Rhys Hoskins
    $1 Nomar Mazara
    $8 Blake Treinen
    $3 Justin Smoak

    I’ve tried using the difference in value analysis, and that tells me to keep Smoak and Mazara. But do I want to load up on CI like that keeping Smoak, Aguilar, and Suarez? As for OF, do I want to keep Hoskins who is only a +$4 value over Mazara? And it seems hard for me to pass on $8 for what Blake Treinen can seemingly deliver.

    1. Doug Anderson says

      Treinen is a must keep. If you can avoid getting into bidding wars for closers it’s always smart, and Treinen is one of the top options, so I keep him for sure. The other one is definitely tougher. I keep Hoskins. He’s still at a decent price and on the way up. If you absolutely don’t want to spend the money on him Smoak does gain a lot of value in OBP leagues.

  4. Andy Burkemper says

    I am setting up a 5 player keeper AL/NL league. How many rounds do you all recommend to be available for draft pick trading? Any ideas?

    1. Doug Anderson says

      I’m not a fan of draft pick trading because I’ve seen people mess up an entire league through bad trades, but if you’re gonna do it, why would you limit it? Half the thrill of it is trying to properly value an early pick against several later picks. Just an opinion. Not sure there’s a right answer.

  5. Charlie says

    Hi Doug: Enjoy your articles. I’m an old timer and have been playing in roti leagues (an AL only and an NL only) for around 30 years. The leagues use the original format, pretty much as you describe in this article. My son Rich and his partner Mike started All Star Stats and Rotoworld around 30 years ago. They ran both until they sold to NBC. They needed a 12th owner when forming the leagues so they asked me. I’ve been hooked since then and still enjoy it as much as ever – it keeps me young :). We have had many arguments about dumping. I think your idea of posting intentions is worth looking into. I’ll suggest it to the commishes. Continue writing interesting articles.

    1. Doug Anderson says

      There are people who still hate the dump trades, but it’s helped take a little bit of their venom away. Harder to complain when everyone had the same chance to deal for the big players.

  6. Ryan says

    I’m in a keeper league where we keep 4 players. What’s your thought on keeping hitters vs pitchers? My hitters are JD, Acuna, Bryant, Correa. My pitchers are Sale, Cole, Buehler.

    1. Doug Anderson says

      I think elite pitchers are getting increasingly more valuable… With that said you have a very tough situation. I would keep JD, Acuna, Sale, and Cole. Bryant and Correa could very well bounce back, but they have question marks.You could substitute Buehler for Cole, but I think the Dodgers will be limiting his innings quite a bit and it’s not like Cole is getting old. If you had more than 4 keepers I’d look at age more, but you’re always gonna be able to come up with four pretty good keepers, so looking much past the coming season is probably thinking too hard.

  7. Dave says

    I agree with everything you said. I am currently in 3 NL only and 1 AL Only leagues. We can keep 11 in 3 and 8 in one NL Only League Keeper leagues also induce trading in the off season. Thanks for a great analysis

    1. Doug Anderson says

      Thanks for reading. Always feel free to throw ideas my way.

  8. Jeff says

    I tried to start a fantasy football league loosely affiliated with The Athletic on Fantrax (which i’ve used for years for my home leagues), but the immediate concern was: There’s no app.

    I know you guys think a link downloaded to my homescreen is an ‘app’, but it can’t compete with the interactiveness of a real app like ESPN, for example, has.

    I’m hoping this is forthcoming, because only then will you be able to take on the behemoths of the industry like espn, yahoo, cbs and


    1. Paul says

      Agreed. An OS-based app is the only thing missing.

      I used the old version from several years ago up until the access was cut off last week. While extremely buggy, it was still more convenient and efficient than the so-called progressive web app.

      Can we at least get that access back?

    2. Mike says

      I find the website on the homescreen thing works fine. Im never like crap, if this was an app Id be in much shape.

  9. James says

    How is the best way to ensure the Commissioner is viewed as not having a competitive advantage? Currently in our league, all claims/call-ups go through only the commissioner and on a daily basis he can claim that same player and get him if he is lower in the standings. Since the claims go through him he is notified of this activity, where no other owners are.
    I have always contended this is an unfair advantage enjoyed only by the commissioner.
    Can your site be configured to remove this advantage and create more transparency for all in the League?
    Any suggestions would be apppreciated.

    1. Doug Andersen says

      It is an unfair advantage even if the commish is perfectly honest. The commish in one league I’m in emails his picks to a specified address before waiver time and then shares the password with another owners once waivers have run. Everyone gets to see the timestamp on the email so there’s no funny business. Most commish services also offer an autmoated system where even the commish can’t see things until they’ve run.

      1. James says

        Does Fantrax offer this feature – thanks Doug?

        1. Doug Andersen says

          Fantrax Waiver Wire

          Yep. This description is for a waiver wire process. As you can see the settings allow different options as to who can view adds/drops.


          This one is for a FAAB system. Again the default is for a blind bidding system.

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