Distance
1¼ mi
Surface
Dirt
Field
20 horses
Purse
$5M
TL;DR · 30-second read
1¼ mi · 20-horse field · Dirt at Churchill Downs · $5M purse · The most-watched two minutes in sports — first Saturday in May since 1875.
104
Avg winning Beyer · 25 yrs
20
Field size · largest TC race
6
Major prep races covered
The race
First run in 1875. The 20-horse field — the largest of any major US race — makes the Derby uniquely chaotic. Twenty post positions widen the talent pool but also widen the variance: trip trouble, traffic on the first turn, and pace dynamics matter more than at any smaller stakes. The points-paying prep system (Road to the Kentucky Derby) qualifies the field through ~30 prep races, with the Florida Derby, Santa Anita Derby, Blue Grass Stakes, Arkansas Derby, and Wood Memorial supplying most starters.
The Derby anchors the Triple Crown. Two weeks later comes the Preakness (1 3/16 mi at Pimlico); three weeks after that, the Belmont Stakes (1½ mi at Belmont Park). Only 13 horses since 1875 have swept all three — most recently Justify in 2018 and American Pharoah in 2015.
Betting model · Kentucky Derby
The model + back-test + ticket structures
Sport-specific factor stack with per-race weight tuning · last 3 runnings analyzed for factor alignment · ticket templates ready to populate when entries are released
Next Kentucky Derby
Entries drop ~5 days before post · model picks light up then
1 day until post
Methodology · factor stack
What the model weights
Base weights tuned for this race's distinctive dynamics — sorted by final weight (highest impact first)
Speed-figure trajectory
What: Beyer / Brisnet figures over the last 3 starts — peak figure plus the slope (rising, flat, declining)
Why: Form trajectory matters more than peak figure alone — a horse rising 95 → 102 → 108 is a sharper bet than a horse who hit 110 once two starts back
Pace projection
↑ boosted 1.3×What: Field's expected early pace (number of speed types, projected first-quarter fraction) + this horse's running style
Why: A speed-heavy field favors closers; a soft pace lets a front-runner steal the race. We project the pace and weight each horse by how it fits
Final-prep performance
What: Finish position + beaten lengths in the last race + class of that race relative to today
Why: The final prep is the cleanest read on the horse's current form. We weight by the prep race's contribution to past Derby/Preakness/Belmont/Classic winners
Distance suitability
What: Career form at today's distance band ± 1/16 mile, plus pedigree distance index (sire's average winning distance)
Why: Some horses don't get the trip — Belmont's 1½ mi exposes pace types; Derby's 1¼ tests the milers; the Classic at 1¼ on dirt rewards proven 9-furlong+ form
Post position
↑ boosted 1.6×What: Track-specific post-position win rate over the last 25 editions of this race, weighted by run-to-first-turn distance
Why: Derby's 20-horse field makes post position critical (rail = 0-for-25, posts 5-14 dominate). Belmont's long run to the first turn neutralizes wide draws.
Trainer + jockey form
What: Trainer's win rate at this race / track / surface + jockey's recent strike rate + their combined ROI in spots like this
Why: Connections matter more in stakes races than maidens — Baffert at the Triple Crown, Pletcher at the Belmont, Brown at the Classic each have outsized strike rates
Class movement
What: Class drop / class jump from previous start, evaluated against the horse's prior performance at that class level
Why: First-time class jumpers face a real ask; horses dropping in class often get a soft trip. Stakes-race-only horses are weighted differently than allowance-graduates
Surface preference
What: Career form on dirt vs turf vs synthetic; mud / slop / fast-track splits when applicable
Why: Most TC horses are dirt-only, but the BC Classic occasionally rains and the mud/slop split flips the form. Per-surface Beyer history is a real signal
Field shape
↓ reduced 0.8×What: Strength of the field (number of G1 winners, average field Beyer) and competitiveness (gap between the chalk and the longshot)
Why: A deep field reduces the chalk's edge; a thin field lets the favorite cruise. Field shape determines exotic payouts and handicap weighting
Back-test · last 3 runnings
How the model framework aligns with results
Honest framing — this is post-hoc factor analysis on actual winners, not "we called this in advance." Showing which factors aligned with each year's winner so you can audit how the methodology fits this race.
Fit assessment
The Derby's 20-horse field makes the model's post-position + pace-projection weights load-bearing. Trifecta + superfecta structures matter more than win-only because the chalk hits ~25% (vs 33%+ at smaller fields) — value plays come from the model identifying mid-priced horses with clean trip projections.
Mystik Dan · 18-1
mid-priceFactors aligned
- ✓ post positionPost 3 — favorable inside-mid draw (saved ground without rail traffic)
- ✓ trainer jockey formBrian Hernandez Jr. earlier won the 2012 BC Classic; Kenny McPeek had targeted the Derby for a decade
- ✓ speed figure trajectoryBeyers rising into the race after a soft Arkansas Derby trip
Model take
Model would have flagged him as a top-5 value play, not the chalk. 18-1 with three positive factors aligned was a textbook trifecta key.
Mage · 15-1
mid-priceFactors aligned
- ✓ final prep performance2nd in Florida Derby — heaviest-weighted prep, just behind Forte who scratched morning of race
- ✓ post positionPost 8 — sweet spot for the modern Derby
Model take
Forte scratch (the chalk) opened the model's value lane. Mage was the model's clearest second choice once Forte came out — 15-1 was overlay value.
Rich Strike · 80-1
longshotModel take
No-read. Rich Strike got into the field at the entry deadline; the model would not have rated him in the top 10. Honest assessment: this win was variance, not signal — the kind of upset the 20-horse field structurally enables ~once a decade.
Ticket structures · Kentucky Derby
How the model recommends you bet
Each structure is a real betting pattern sharps use, sized to this race's field + payout dynamics. Specific horses fill in once entries are released.
Trifecta key — top 3 model picks over the field
Structure: Key your top model pick with 2-3 backup horses to finish 2nd-3rd, then spread to the rest of the 20-horse field for the third position.
Why this race: 20-horse fields produce massive trifecta payouts (Rich Strike's 2022 trifecta paid $4,983 for $1). The structure rewards conviction on a top pick + spread coverage on the underneath spots.
Superfecta wheel — chalk + value spread
Structure: Top model pick on top, 4-5 horses for 2nd, full field underneath for 3rd-4th.
Why this race: 10-cent superfecta minimum at Churchill keeps the cost down. 2022 superfecta paid $321,500.10 for a $1 ticket; the structure is asymmetric — small dollars up, 5-6 figures down.
Pick 4 anchored at the Derby
Structure: Single your top model pick in the Derby leg, then spread 2-3 horses in each of the other three races on the late Pick 4 sequence.
Why this race: Late Pick 4 at Churchill on Derby Day routinely carries a $1M+ guaranteed pool. Singling the Derby leg lets you spread heavily in the other legs.
Post-position win count · since 2000
Where the winners broke from
25 editions · post 1 (rail) is 0-for-25 · the "death posts" cluster at the rail and outermost entries · most winners come from posts 5-18
Final-prep contribution · since 2000
Where Derby winners came from
Florida + Santa Anita + Arkansas Derbies account for 60% of modern Derby winners · weight prep results from these three heaviest when handicapping
Mystik Dan (2024 · 4th) · Country House (2019 · 3rd) · American Pharoah (2015) · +2 more
Rich Strike (2022 · 3rd)
Mine That Bird (2009 · 4th)
Animal Kingdom (2011)
War Emblem (2002)
Speed figure thresholds
Beyer + final-prep correlation
Avg winning Beyer
104
Since 2000 (25 editions)
Highest winning Beyer
116
Monarchos (2001) · only second sub-2:00 Derby ever
Final-prep threshold
95+
Beyer in last race correlates with above-baseline (5%) win probability
Pace dynamics
The 20-horse pace problem
The 20-horse field creates an unusually fast early pace — average first-quarter fraction is :22.85 and average half is :46.40. Pure speed types get cooked; pressers + stalkers who can sit second-flight and pick off tiring leaders in the stretch dominate.
Wire-to-wire winners since 2000
- ✓ Big Brown (2008)
One in 25 editions. Pure pace is the hardest trip.
Deep closers since 2000
- ✓ Mine That Bird (2009 · 19 lengths back at the half)
- ✓ Country House (2019 · 17 lengths back)
- ✓ Animal Kingdom (2011 · 12 lengths back)
Three of 25 — closers benefit when speed melts.
Recent winners · last 25
Every winner since 2000
Year · horse · jockey · trainer · post · odds · time · Beyer · final prep
| Year | Winner | Jockey | Trainer | Post | Odds | Time | Beyer | Final prep |
|---|---|---|---|---|---|---|---|---|
| 2024 | Mystik Dan Three-horse photo finish — narrowest Derby margin since 2003 | Brian Hernandez Jr. | Kenny McPeek | 3 | 18-1 | 2:03.34 | 99 | Arkansas Derby (4th) |
| 2023 | Mage Castellano's first Derby win in 16 starts | Javier Castellano | Gustavo Delgado | 8 | 15-1 | 2:01.57 | 102 | Florida Derby (2nd) |
| 2022 | Rich Strike Got in the field at the entry deadline. Second-biggest Derby upset ever. | Sonny Leon | Eric Reed | 20 | 80-1 | 2:02.61 | 99 | Lexington Stakes (3rd) |
| 2021 | Medina Spirit (DQ) Mandaloun awarded the win after Medina Spirit's DQ for betamethasone | John Velazquez | Bob Baffert | 8 | 12-1 | 2:01.02 | 100 | Santa Anita Derby (2nd) |
| 2020 | Authentic Run in September due to COVID — only fall-run Derby in modern era | John Velazquez | Bob Baffert | 18 | 8-1 | 2:00.61 | 105 | Santa Anita Derby (1st) |
| 2019 | Country House (DQ to Maximum Security) First Derby winner via DQ in race history | Flavien Prat | Bill Mott | 20 | 65-1 | 2:03.93 | 91 | Arkansas Derby (3rd) |
| 2018 | Justify Broke the 'Curse of Apollo' — first Derby winner since 1882 without a 2yo start. Triple Crown. | Mike Smith | Bob Baffert | 7 | 5-2 | 2:04.20 | 103 | Santa Anita Derby (1st) |
| 2017 | Always Dreaming | John Velazquez | Todd Pletcher | 5 | 9-2 | 2:03.59 | 94 | Florida Derby (1st) |
| 2016 | Nyquist First undefeated Derby winner since Seattle Slew (1977) | Mario Gutierrez | Doug O'Neill | 13 | 2-1 | 2:01.31 | 102 | Florida Derby (1st) |
| 2015 | American Pharoah Triple Crown — first since 1978 (Affirmed) | Victor Espinoza | Bob Baffert | 18 | 5-2 | 2:03.02 | 105 | Arkansas Derby (1st) |
| 2014 | California Chrome | Victor Espinoza | Art Sherman | 5 | 5-2 | 2:03.66 | 97 | Santa Anita Derby (1st) |
| 2013 | Orb | Joel Rosario | Shug McGaughey | 16 | 5-1 | 2:02.89 | 104 | Florida Derby (1st) |
| 2012 | I'll Have Another | Mario Gutierrez | Doug O'Neill | 19 | 15-1 | 2:01.83 | 101 | Santa Anita Derby (1st) |
| 2011 | Animal Kingdom | John Velazquez | Graham Motion | 16 | 20-1 | 2:02.04 | 103 | Spiral Stakes (1st) |
| 2010 | Super Saver | Calvin Borel | Todd Pletcher | 4 | 8-1 | 2:04.45 | 104 | Arkansas Derby (2nd) |
| 2009 | Mine That Bird Largest Derby upset margin (6¾ lengths at 50-1) | Calvin Borel | Bennie Woolley Jr. | 8 | 50-1 | 2:02.66 | 105 | Sunland Derby (4th) |
| 2008 | Big Brown Wire-to-wire from outside post — only 4 starts entering Derby | Kent Desormeaux | Rick Dutrow | 20 | 5-2 | 2:01.82 | 109 | Florida Derby (1st) |
| 2007 | Street Sense First BC Juvenile winner to win the Derby | Calvin Borel | Carl Nafzger | 7 | 9-2 | 2:02.17 | 107 | Blue Grass Stakes (2nd) |
| 2006 | Barbaro Highest Beyer of any Derby winner since 2000 | Edgar Prado | Michael Matz | 8 | 6-1 | 2:01.36 | 111 | Florida Derby (1st) |
| 2005 | Giacomo | Mike Smith | John Shirreffs | 10 | 50-1 | 2:02.75 | 100 | Santa Anita Derby (4th) |
| 2004 | Smarty Jones | Stewart Elliott | John Servis | 15 | 4-1 | 2:04.06 | 107 | Arkansas Derby (1st) |
| 2003 | Funny Cide First New York-bred to win the Derby | Jose Santos | Barclay Tagg | 6 | 13-1 | 2:01.19 | 109 | Wood Memorial (1st) |
| 2002 | War Emblem | Victor Espinoza | Bob Baffert | 5 | 20-1 | 2:01.13 | 114 | Illinois Derby (1st) |
| 2001 | Monarchos Only second sub-2:00 Derby in history (Secretariat 1973) | Jorge Chavez | John Ward Jr. | 16 | 10-1 | 1:59.97 | 116 | Florida Derby (1st) |
| 2000 | Fusaichi Pegasus First Derby favorite to win since Spectacular Bid (1979) | Kent Desormeaux | Neil Drysdale | 15 | 2-1 | 2:01.12 | 108 | Wood Memorial (4th) |
All-time leaders
Trainers + jockeys with the most Derby wins
Trainers
Bob Baffert
6
1997-present (modern era titan)
Medina Spirit (2021, DQ) · Authentic (2020) · Justify (2018) · American Pharoah (2015)
Ben A. Jones
6
1938-1957 (Calumet Farm dynasty)
D. Wayne Lukas
4
1988-1999 (modern training pioneer)
Todd Pletcher
2
2010-present
Always Dreaming (2017) · Super Saver (2010)
Doug O'Neill
2
2012-2016
Nyquist (2016) · I'll Have Another (2012)
Jockeys
Eddie Arcaro
5
1938-1952 (Hall of Fame, all-time tied leader)
Bill Hartack
5
1957-1969 (Hall of Fame, all-time tied leader)
Bill Shoemaker
4
1955-1986
John Velazquez
3
2011-present (active leader)
Calvin Borel
3
2007-2010 (3 wins in 4 years)
Mike Smith
2
2005, 2018
Victor Espinoza
3
2002-2015 (American Pharoah TC)
Triple Crown context
Derby winners who swept all three
Only 13 horses since 1875 · 5 in the modern era
2018
Justify
Undefeated TC — only the second since Seattle Slew
2015
American Pharoah
Ended a 37-year drought (since Affirmed 1978)
1978
Affirmed
Beat Alydar in all three legs
1977
Seattle Slew
Only undefeated TC winner before Justify
1973
Secretariat
Belmont win by 31 lengths — racing's GOAT moment
Famous moments
Vignettes worth knowing
2022
Rich Strike, 80-1
Got into the field at the entry deadline when another horse scratched. Sonny Leon weaved through traffic from the rail to win going away. The trifecta paid $4,983 for $1; the superfecta paid $321,500.10 for $1. Second-biggest Derby upset by closing odds.
2019
Maximum Security DQ
First-ever disqualification of a Derby winner for interference. After a 22-minute stewards' inquiry, 65-1 Country House was awarded the win. Maximum Security's connections sued for reinstatement; the suit was dismissed.
2018
Justify breaks the Curse of Apollo
First Derby winner since Apollo (1882) without a 2-year-old start. 136-year-old streak broken, then Justify went on to sweep the Triple Crown.
2015
American Pharoah ends the drought
First Triple Crown winner in 37 years. Bob Baffert had failed Triple Crown bids three previous times (Silver Charm '97, Real Quiet '98, War Emblem '02). The Belmont was a national event — 90,000+ at Belmont Park.
2009
Mine That Bird, 50-1
Calvin Borel rode the rail through traffic and won by 6¾ lengths — the largest winning margin since Assault (1946). Trainer Bennie Woolley Jr. drove the horse to Louisville from New Mexico in his own trailer.
2008
Big Brown, wire-to-wire from post 20
Only modern Derby winner to lead at every call from the far-outside post. Had only 4 lifetime starts entering the race. Triple Crown bid ended at the Belmont when he was eased on the backstretch.
2001
Monarchos breaks the 2:00 barrier
Won in 1:59.97 — only the second sub-2:00 Derby in history. The other? Secretariat (1:59.40, 1973) — still the track + Derby record.
Betting trends · Derby-specific
What sharps watch for
These are recurring patterns, not guarantees · use as inputs to a handicap, not as standalone bets
- 01
Trifectas + superfectas pay massively because of field size — 2022 Derby trifecta with Rich Strike paid $4,983 for $1; superfecta paid $321,500.10. Plan for variance, not chalk.
- 02
Favorites win ~25% of modern Derbies vs. ~30-33% in smaller-field G1s — the 20-horse field structurally suppresses the chalk's hit rate.
- 03
Posts 5-14 have produced the bulk of recent winners; the rail (post 1) is 0-for-25 since 2000, posts 2 and 9 also 0-for-25, posts 11/12/14/17 also 0.
- 04
Horses with a final-prep Beyer 95+ win ~75% of Derbies; horses with sub-90 final-prep Beyers rarely win (Country House 2019 was an outlier).
- 05
Final-prep race matters: Florida Derby (6 wins) + Santa Anita Derby (5) + Arkansas Derby (4) account for 60% of Derby winners since 2000.
- 06
Speed types often get cooked — the 20-horse pace is unusually fast (~:22.85 first quarter average), so pressers + stalkers tend to outperform pure pace types.
- 07
Bob Baffert-trained horses have a longer-run ROI edge than any other trainer at the meet — even with the Medina Spirit DQ, his win rate justifies a small premium on his entries.
Where to bet the Derby
US pari-mutuel wagering on the Derby happens through licensed operators. TwinSpires (Churchill Downs-owned) is the official ADW; it carries every legal bet type — win/place/show, exacta, trifecta, superfecta, daily double, Pick 3, Pick 4, Pick 6. TVG (FanDuel-owned) is the other major US racing book. Caesars Sportsbook + DraftKings Horse Racing also offer Derby wagering in licensed states.
Continue down the Triple Crown
Next stops on the trail
Leg 2 · Third Saturday in May
Preakness Stakes
1 3/16 mi at Pimlico · two weeks after the Derby · smaller field, tighter track, Derby winner usually comes back as the chalk
Race profile →Leg 3 · Early June
Belmont Stakes
1½ mi at Belmont Park · the "Test of the Champion" · has shattered Triple Crown bids more than it's confirmed them
Race profile →Bet responsibly · 21+ · 1-800-GAMBLER · Pari-mutuel wagering laws vary by state.