10/12/26 : The Difficulty of the Climb
The “modern era” minor league classification system began in 1963 with four core classifications (AAA, AA, A, and Rookie) which later expanded into multiple subdivisions including Short-Season A and Rookie Advanced. In 2021 MLB took direct control of the minor league system reducing total full-season teams to 120 (four per MLB franchise) and established the four-level full-season framework of AAA, AA, High A and Low A (along with rookie-level complex leagues).
Each step up the climb on the rungs of the player development process has its own challenges and it’s certainly an individual experience as to which is the most difficult. I asked a bunch of folks including fans, agents, writers, photographers, broadcasters, players, scouts, coaches and executive leadership from or following multiple major league franchises their opinion as to what level they thought is the most difficult to transition to in player development basing my question on whether it be Low A to High A, High A to AA, or AA to AAA. I received 64 responses back.
Some expanded the criteria to include the jump from the DSL to the FCL along with the complexes to Low A and all agreed that the major league breakthrough was the most difficult overall. Many felt that the MLB/AAA gap is even wider today than ever before as symbolized in a response to the inquiry by a prominent scout - “There has never been a bigger gap between AAA and MLB. Players pushed through the systems and an overall lack of AAA quality.”
Before I reveal the responses here is some data to digest by level.
MLB Level :
2026 Average Age per League :
National - 27.8 (position players), 29.1 (pitchers)
American - 27.8 (position players), 29.2 (pitchers)
2026 Combined League Batting Average/On Base Percentage/Slugging Percentage/On Base Plus Slugging
National - .246/.321/.405/.726
American - .241/.316/.396/.712
2026 Walk,Hits per Innings Pitched/Strikeouts Per Nine/Walks Per Nine/Strikeout to Walk Ratio
National - 1.308/8.4/3.4/2.45
American - 1.301/8.6/3.4/2.53
AAA Level :
There are two AAA leagues (International & Pacific).
2026 Average Age per League :
International - 26.1 (position players), 27.2 (pitchers)
Pacific - 26.8 (position players), 27.4 (pitchers)
2026 Combined League Batting Average/On Base Percentage/Slugging Percentage/On Base Plus Slugging
International - .252/.343/.416/.759
Pacific - .270/.360/.433/.793
2026 Walk,Hits per Innings Pitched/Strikeouts Per Nine/Walks Per Nine/Strikeout to Walk Ratio
International - 1.450/9.2/4.4/2.08
Pacific - 1.563/8.5/4.6/1.83
AA Level :
There are three AA leagues (Eastern, Southern, Texas).
2026 Average Age per League :
Eastern - 23.6 (position players), 24.8 (pitchers)
Southern - 23.7 (position players), 24.6 (pitchers)
Texas - 23.8 (position players), 24.5 (pitchers)
2026 Combined League Batting Average/On Base Percentage/Slugging Percentage/On Base Plus Slugging
Eastern - .248/.336/.413/.750
Southern - .245/.336/.411/.747
Texas - .254/.348/.420/.768
2026 Walk,Hits per Innings Pitched/Strikeouts Per Nine/Walks Per Nine/Strikeout to Walk Ratio
Eastern - 1.410/9.8/4.2/2.32
Southern - 1.395/9.4/4.2/2.22
Texas - 1.461/9.7/4.5/2.16
High A Level :
There are three High A leagues (Midwest, Northwest, South Atlantic).
2026 Average Age per League :
Midwest - 22.1 (position players), 22.8 (pitchers)
Northwest - 22.4 (position players), 23.1 (pitchers)
South Atlantic - 22.0 (position players), 23.2 (pitchers)
2026 Combined League Batting Average/On Base Percentage/Slugging Percentage/On Base Plus Slugging
Midwest - .249/.355/.411/.766
Northwest - .254/.348/.416/.764
South Atlantic - .247/.349/.413/.762
2026 Walk,Hits per Innings Pitched/Strikeouts Per Nine/Walks Per Nine/Strikeout to Walk Ratio
Midwest - 1.511/9.7/5.1/1.92
Northwest - 1.471/9.5/4.5/2.13
South Atlantic - 1.466/9.9/4.8/2.06
Low A Level :
There are three Low A leagues (California, Carolina, Florida State).
2026 Average Age per League :
California - 21.0 (position players),22.0 (pitchers)
Carolina - 20.3 (position players), 21.9 (pitchers)
Florida State - 20.9 (position players), 22.0 (pitchers)
2026 Combined League Batting Average/On Base Percentage/Slugging Percentage/On Base Plus Slugging
California - .262/.359/.424/.783
Carolina - .241/.351/.376/.727
Florida State - .245/.354/.391/.745
2026 Walk,Hits per Innings Pitched/Strikeouts Per Nine/Walks Per Nine/Strikeout to Walk Ratio
California - 1.540/10.0/4.7/2.10
Carolina - 1.479/9.5/5.2/1.83
Florida State - 1.493/10.0/5.1/1.97
Lastly here’s a summary of the 64 responses I received highlighting some of the commentary.
High A to AA : (37 of the 64 responses - 58 %)
“Since the structural changes in 2021, Low-A is more like short-season, High-A is kind of like a merge of the old Low-A and High-A but Double-A is still the same, that’s where you learn most about guys.“
‘Over my career, I've seen many guys plateau at AA or cannot find success. The competition is fierce there due to the fact that most teams usually carry their most coveted and developed prospects at that level.”
‘High A to AA generally. Although the levels have been muddled in recent years because the typical age by level has been skewed.”
“High A to AA because quite simply…it goes to the old baseball saying: “If you can play well in AA, you can play in the majors.”
‘Transitioning to AA is the most difficult to me. If you are young, talented and successful at AA, you usually have a bright future.”
“I’m my opinion, the move from High-A to AA is the separator. I think that’s where you show whether or not you have a legitimate shot at making the big leagues. There it no longer becomes about promise, and it becomes about production. I think the move from Low-A to High-A is pretty similar to the move from AA to AAA, and there isn’t a ton of difference in competition change especially now that roster limits don’t really allow you to carry as many former big leaguers in AAA. But that move to AA is a significant jump.”
“High A to AA has generally been the biggest leap. Usually if a guy performs in AA there’s a good chance of future success. I think that now there is such a big difference between AAA and MLB so that answer might be different now.”
“High A to AA. To me it seems the quality of pitching is better and you start to see some players that know how to pitch. Speed of the game is faster. I will say in AAA you get the veteran arms that can get the young guys out. But I notice a jump when I watch High A compared to Double A.”
“I’ve always thought High A to Double A. High A might still have some stragglers talent wise, but Double A is an introduction to guys who are either major league experienced, adjacent, or on a trajectory to the bigs maybe within a year. Plus a good mix of vets and younger talent.”
“I would say High A to AA. That’s the first major jump that you see for everything. As a pitcher it’s where you have to learn how to truly pitch and bring your best stuff. It’s also a lot more independent in AA for your routine and treatment, so you have to grow up a bit and vocalize what you need or learn what works best for you to keep yourself on the field.”
“Managers, coaches, instructors, and other player-development people have consistently told me that the jump from High-A to Double-A was the biggest. They generally said it was the separator between the real prospects and the younger guys who flash and fizzle out. I'm not sure if that's still the case. I think it is.”
“I would say from my experience and what I’ve heard from other people the move to AA is a difficult one and I noticed the biggest difference in talent of the hitters and specifically how they control the zone.”
“High A to double A. Pitchers just are able to hit spots and figure you out better.”
“High A to Double A. In Double A pitchers have a lot better control of their off speed and hit their spots.”
AA to AAA : (17 of the 64 responses - 27 %)
“From my personal experience it’s Double A to Triple A. I look at some players who did really well at AA and then looked mediocre when they got to the AAA level.”
“This is just a guess… AA to AAA. You have the minor league free agents with big league experience, big league rehabs etc. You fly to a few places. I think that would be the biggest jump in terms of competition and travel.”
“AA to AAA, It’s a wider variety of talents. Fringe big league guys, prospects. Pitching I think it is A ball to AA. Overall AA to AAA.”
“A lot of people told me High A to AA was the hardest. For me it was AA to AAA.”
“AA to AAA. AAA is just a different level. You have guys who have played in the big league and then some younger kids. You see some guys who dominate at AAA but then struggle in the big leagues. It shows why it’s so hard to stick.”
“I think personally the biggest jump to conquer was the AA to AAA but that’s from personal experience.”
“That’s a tough one, every player adapts differently but personally for me it was AA to AAA. Once I got to AAA the hitters had more of an approach at the plate and I didn’t get as many swings out of the zone as I did in AA.”
“I think the jump to AAA is the hardest. The competition is better and you are playing against some former major league players. A big difference is also adjusting to the MLB baseball.“
“For pitchers it’s AA to AAA. At the AA level two to three guys in the lineup might hit in the big leagues. At the AAA level two to three guys will one day play in the big leagues and the other six already have.”
“I’m gonna go AA to AAA. For hitters they’re not going to be able to only hunt fastballs. For pitchers they have to adapt to the MLB ball and throw their secondaries for strikes.”
“Of those three I would go AA to AAA, Low A to High A and then High-A to AA. AAA isn’t a roadblock for everyone, but the change in ball for pitchers can affect some guys and weaknesses are more exploitable. AAA is where that actually catches up to you. On the flip side if you are ultra aggressive or have trouble hitting velocity or breaking balls there are more guys who will exploit that. However, in my opinion the biggest jump in the minors is complex to full season, and AAA to the majors is bigger than all of them combined.”
“I think Triple-A because that's when younger players face other standout younger players, veteran Triple-A players, Quad A type players and veterans with serious MLB experience.”
“AAA to the big leagues is absolutely the hardest. But after that I think AA to AAA. Mainly just because of how many arms in AAA have thrown in the big leagues and guys pitch with more of a specific plan.”
“AAA, it just gets tougher every step along the journey.”
Low A to High A : (6 of the 64 responses - 9 %)
“My guess would be Low A to High A based on Low A travel vs the upper level travel. Low A is all relatively close then once you move up a lot longer bus rides, etc.”
“Low A to High A. I don’t know if it’s the extended travel that they haven’t dealt with before or the early season cold temps that many are facing for the first time in their lives.”
“I think Low A to High A has become a lot bigger jump than it has in the past. With the way the leagues are now Low A is more like rookie ball and I feel like High A is closer to AA than it is Low A. So, the jump used to be from High A to AA being the “separator” jump, I feel like that has slid down to Low A to High A. Also, I feel like the jump from AAA to the big leagues is bigger than it ever has been because the depth of quality pitching is the big leagues compared to AAA.”
“Low A to High A - the gap in discipline, refined skillset and maturity is greater.”
“From a compete standpoint it would be AAA. But for development the transition I would say is from Low A to High A. The reason is the travel, you have to adjust your preparation process to be able to perform everyday/ or every start. You take long bus rides, stay in some uncomfortable beds, and maybe don’t have access to the food you want to fuel your body. You have to be able to manage and make adjustments to perform at a high level.”
Other (4 of the 64 responses - 6 %)
“DSL to Complex and AAA to MLB are the most difficult transitions. The language barrier, acclimating to a new country are big obstacles but also the talent level in the DSL is now spread thin with so many teams.”
“Just on the pitching side I think the jump from the DSL/Complex to A ball is a big one. Generally takes some time for guys to get a feel for it. And then A ball to AA as well. They definitely all have their own challenges. The jump from AA to AAA is noticeable too. Not using the big league baseballs in AA but then using them in AAA is an adjustment that takes time. Basically when you start facing guys with more polished approaches and they aren’t just swinging at everything is when it gets more difficult.”
“I will say every level is difficult, everything, it’s mental stuff.”
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