Senior quarterback for Mississippi State. 2020: 1,283 passing yards, 6 TD, 11 INT.
6′5″ · 225 lb · Coto De Caza, CA
Recruiting
PRO recruit
No. 48 nationally · Signed with Stanford
Statement game623 yds · 5 TDat LSU (FBS) · W 44-34
Top 0.1% passing yards game since 2021.
That was an awful 3 straight plays for Costellor/CFB game thread · ▲ 10His career numbers, season by seasonThe story
4 quarterback for Mississippi State. 2020: 1,283 passing yards, 6 TD, 11 INT.
K.J. Costello
Two head coaches in four seasons, at two different programs. One game to point at: 623 pass yds, 5 pass TD against LSU — Week 4, 2020.
Low coverage — composed from the verified record.
How it ended
Four seasons at Mississippi State, 7,403 passing yards — his college career is complete.
His career
He was on the field for 4 seasons. That is rarer than it sounds.
Career arc
Coaching lineage · 2017–2020
3 coachesPlayed under 3 different head coaches: Dan Mullen, Joe Moorhead, and Mike Leach. Multi-era developmental context.
Season context · Team result + system
Where this profile ranks vs the QB cohort
Box-score percentiles
Concern: interceptions (4th percentile).
Percentiles versus same-position peers with enough snaps this season, based on box-score rates.
Pass Profile · Completions by yards gained (PBP)
Adjusted ANY/A, sack rate, and where the yards came from
Adjusted ANY/A
3.61157 of 171 QBsSack rate
6.3%93 of 171 QBsSacked on 6.3% of dropbacks (93 of 171) and Adjusted ANY/A trails the field (157 of 171).
Adjusted ANY/A uses full-season box-score totals (attempts, yards, TDs, INTs); sack rate is play-by-play-derived.
Short
0–9 ydsMiddle
10–19 ydsDeep
20+ ydsOverall 64.4% completion on 208 attempts · 17 deep completions averaging 31.8 yds.
Splits · Per-game
2020 season · 6 games
Home vs Road
| YDS/g | TD/g | YPA | INT/g | |
|---|---|---|---|---|
| Home3g | 137 | 0.3 | 3.3 | 1.7 |
| Road3g | 290 | 1.7 | 5.4 | 2.0 |
First half vs Second half
| YDS/g | TD/g | YPA | INT/g | |
|---|---|---|---|---|
| Weeks 1-74g | 317 | 1.5 | 6.1 | 2.5 |
| Weeks 8+2g | 8.0 | 0.0 | 0.8 | 0.5 |
Supporting cast · Scheme
Staff and system around the player
Head Coach
Jeff Lebby
Scheme reads (pass share, tempo, sack rate) need at least 3 team games — 2 games in so far.
Player standing · 2020
Earning real snaps in the rotation without a starting job.
| Season | Team | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020 | Mississippi State | 134 | 209 | 64.1% | 1,283 | 6.1 | 6 | 11 | 114.6 | 21 | -- | -- |
| 2019 | Stanford | 101 | 166 | 60.8% | 1,028 | 6.2 | 6 | 3 | 121.2 | -- | -- | -- |
| 2018 | Stanford | 267 | 411 | 65.0% | 3,519 | 8.6 | 29 | 11 | 154.8 | -- | -- | -- |
| 2017 | Stanford | 124 | 211 | 58.8% | 1,573 | 7.5 | 14 | 4 | 139.5 | -- | -- | -- |
| Career | 626 | 997 | 62.8% | 7,403 | 7.4 | 55 | 29 | 137.5 | 21 | -- | -- |
| Season | Team | |||||
|---|---|---|---|---|---|---|
| 2020 | Mississippi State | 24 | -65 | -2.7 | 0 | -- |
| 2019 | Stanford | 18 | 24 | 1.3 | 0 | -- |
| 2018 | Stanford | 42 | -20 | -0.5 | 0 | -- |
| 2017 | Stanford | 28 | 92 | 3.3 | 3 | -- |
| Career | 112 | 31 | 0.3 | 3 | -- |
SIGNATURE GAME · Week 4 · 2020
W 44–34
at LSU
623 yds · 5 TD · 2 INT · -38 rush yds (5 car)
Edged out LSU on the road in a shootout.
With K. Hill — 34 rush yds (7 car) · O. Mitchell — 7 rec · 183 yds · 2 TD
Signature plays · top plays by |EPA|
The plays that mattered most
Game log · Week-by-week
2020 season · 6 games
| Wk | Opp | CMP/ATT | YDS | TD | INT | YPA | QBR | Note |
|---|---|---|---|---|---|---|---|---|
| Wk 4 | W 44-34@ LSU | 36/60 | 623 | 5 | 2 | 10.4 | — | Season-high 623 yds |
| Wk 5 | L 14-21vs Arkansas | 43/59 | 313 | 1 | 3 | 5.3 | — | 3 INTs — rough day |
| Wk 6 | L 2-24@ Kentucky | 36/55 | 232 | 0 | 4 | 4.2 | — | 4 INTs — rough day |
| Wk 7 | L 14-28vs Texas A&M | 15/22 | 99 | 0 | 1 | 4.5 | — | |
| Wk 9 | L 0-41@ Alabama | 4/11 | 16 | 0 | 0 | 1.5 | — | |
| Wk 16 | W 51-32vs Missouri | 0/2 | 0 | 0 | 1 | 0.0 | — | |
| Total | 134/209 | 1283 | 6 | 11 | 4.3 | — |
Player DNA