Patrick Mahomes had the most single-game yards as a prep while Joe Burrows threw most touchdowns.
Kansas City Chiefs quarterback Patrick Mahomes threw for 478 yards on Nov. 18, 2018 against the Los Angeles Rams, marking the highest yardage total in his NFL career. But that total is nowhere close to the passing yardage he accumulated in a single game as a prep player at Whitehouse (Texas).
The Super Bowl LIV winner threw for 619 yards in a 65-60 loss to Poteet during his senior year, giving him the highest single-game yardage total at the high school level of any NFL Week 1 starting quarterback. And it's not even close.
MaxPreps has compiled the highest single-game prep total for every NFL quarterback who started in Week 1 of the 2022 season. Mahomes is 75 yards ahead of the No. 2 quarterback, Derek Carr of the Las Vegas Raiders, who threw for 544 yards while at Bakersfield Christian.
Mahomes does not have the highest touchdown total, however, as Joe Burrow holds that distinction after throwing eight touchdowns in a 55-46 over Fairland.
Jalen Hurts of the Philadelphia Eagles has 554 combined yards from his highest passing game as he threw for 373 yards and added 181 on the ground for Channelview in a 70-49 win over Port Arthur Memorial.
Following is a list of all 32 starting quarterbacks from Week 1 with their highest yardage total as a prep, listed by order of yardage.

Kansas City Chiefs quarterback Patrick Mahomes threw for 619 yards in high school, the highest prep total among all 32 Week 1 NFL signal-callers.
Photo: Kyle Dantzler
Each NFL quarterback's highest high school yardage totals
619 — Patrick Mahomes, Whitehouse (Texas)
NFL Team: Chiefs
Stats: 35 for 60, 619 yards, 5 touchdowns
Opponent: Poteet, 60-65 loss
Date: Nov. 13, 2013
544 — Derek Carr, Bakersfield Christian (Bakersfield, Calif.)
NFL Team: Raiders
Stats: 37 for 44, 544 yards, 4 touchdowns
Opponent: Arvin, 42-35 win
Date: Nov. 7, 2008
493 — Tua Tagovailoa, St. Louis (Honolulu)
NFL Team: Dolphins
Stats: 41 for 47, 493 yards, 5 touchdowns
Opponent: Iolani, 42-24 win
Date: Sept. 23, 2016
492 — Joe Burrow, Athens (The Plains, Ohio)
NFL Team: Bengals
Stats: 28 for 37, 492 yards, 8 touchdowns
Opponent: Fairland, 55-46 win
Date: Sept. 27, 2013
476 — Mitch Trubisky, Mentor (Ohio)
NFL Team: Steelers
Stats: 36 for 48, 476 yards, 4 touchdowns
Opponent: St. Edward, 63-56 win
Date: Nov. 10, 2012
475 — Justin Herbert, Sheldon (Eugene, Ore.)
NFL Team: Chargers
Stats: 25 for 40, 475 yards, 5 touchdowns
Opponent: Jesuit, 61-55 loss
Date: Sept. 11, 2015
473 — Dak Prescott, Haughton (La.)
NFL Team: Cowboys
Stats: 21 for 26, 473 yards, 5 touchdowns
Opponent: Woodlawn, 54-35
Date: Nov. 19, 2010
471 — Joe Flacco, Audubon (N.J.)
NFL Team: Jets
Stats: 37 for 55, 471 yards, 3 touchdowns
Opponent: West Deptford, 64-35 loss
Date: Nov. 9, 2002
468 — Baker Mayfield, Lake Travis (Austin, Texas)
NFL Team: Panthers
Stats: 27 for 37, 468 yards, 6 touchdowns
Opponent: Aledo, 62-35 win
Date: Sept. 9, 2011
466 — Kyler Murray, Allen (Texas)
NFL Team: Cardinals
Stats: 17 for 24, 466 yards, 3 touchdowns
Opponent: Southlake Carroll, 49-27 win
Date: Aug. 30, 2013
442 — Josh Allen, Firebaugh (Calif.)
NFL Team: Bills
Stats: 34 for 51, 442 yards, 5 touchdowns
Opponent: Immanuel, 54-40 win
Date: Nov. 22, 2013
411 — Matthew Stafford, Highland Park (Dallas)
NFL Team: Rams
Stats: 13 for 22, 411 yards, 4 touchdowns
Opponent: Texas (Texarkana), 38-31 win
Date: Nov. 11, 2005
403 — Trevor Lawrence, Cartersville (Ga.)
NFL Team: Jaguars
Stats: 18 for 23, 403 yards, 4 touchdowns
Opponent: Bartram Trail, 52-45 win
Date: Aug. 26, 2017
391 — Marcus Mariota, St. Louis (Honolulu)
NFL Team: Falcons
Stats: 14 for 20, 391 yards, 2 touchdowns
Opponent: Punahou, 42-7 win
Date: Oct. 15, 2010
373 — Jalen Hurts, Channelview (Texas)
NFL Team: Eagles
Stats: 12 for 27, 373 yards, 4 touchdowns; 20 carries, 181 yards rushing, 5 touchdowns
Opponent: Port Arthur Memorial, 70-49 win
Date: Sept. 26, 2014
368 — Geno Smith, Miramar (Fla.)
NFL Team: Seahawks
Stats: 20 for 31, 368 yards, 4 touchdowns
Opponent: Deerfield Beach, 34-30 win
Date: Dec. 5, 2008
367 — Daniel Jones, Charlotte Latin (Charlotte, N.C.)
NFL Team: Giants
Stats: 13 for 17, 367 yards, 6 touchdowns
Opponent: Providence Day, 55-17 win
Date: Oct. 9, 2014
358 — Jacoby Brissett, Dwyer (Palm Beach Gardens, Fla.)
NFL Team: Browns
Stats: 13 for 22, 358 yards, 4 touchdowns
Opponent: Stranahan, 45-3 win
Date: Nov. 19, 2010
352 — Aaron Rodgers, Pleasant Valley (Chico, Calif.)
NFL Team: Packers
Stats: 22 for 33, 352 yards, 1 touchdown
Opponent: Corning, 42-28 loss
Date: Sept. 21, 2001
344 — Jared Goff, Marin Catholic (Kentfield, Calif.)
NFL Team: Lions
Stats: 14 for 30, 344 yards, 4 touchdowns
Opponent: St. Ignatius, 28-21 win
Date: Sept. 1, 2012
343 — Davis Mills, Greater Atlanta Christian (Norcross, Ga.)
NFL Team: Texans
Stats: 17 for 28, 343 yards, 2 touchdowns
Opponent: Wesleyan, 35-31 win
Date: Nov. 6, 2015
331 — Tom Brady, Serra (San Mateo, Calif.)
NFL Team: Buccaneers
Stats: 17 for 34, 331 yards, 2 touchdowns
Opponent: Sacred Heart Cathedral, 20-13 loss
Date: Oct. 1, 1994
329 — Lamar Jackson, Boynton Beach (Fla.)
NFL Team: Ravens
Stats: 13 for 21, 329 yards, 2 touchdowns; 29 carries, 169 yards rushing, 5 touchdowns
Opponent: Coconut Creek, 63-58 win
Date: Oct. 24, 2014
321 — Jameis Winston, Hueytown (Ala.)
NFL Team: Saints
Stats: 25 for 29, 321 yards, 4 touchdowns
Opponent: John Carroll Catholic, 57-15 win
Date: Oct. 14, 2011
291 — Russell Wilson, Collegiate (Richmond, Va.)
NFL Team: Broncos
Stats: 21 for 37, 291 yards, 2 touchdowns; 30 carries, 223 yards rushing, 3 touchdowns
Opponent: Fork Union, 38-16 win
Date: Nov. 18, 2006
289 — Kirk Cousins, Holland Christian (Holland, Mich.)
NFL Team: Vikings
Stats: 23 for 38, 289 yards
Opponent: Greenville, 22-21 win
Date: Sept. 8, 2006
263 — Justin Fields, Harrison (Kennesaw, Ga.)
NFL Team: Bears
Stats: 16 for 20, 263 yards, 5 touchdowns; 8 carries, 135 yards rushing, 2 touchdowns
Opponent: Sprayberry, 63-41 win
Date: Oct. 6, 2017
234 — Carson Wentz, Century (Bismarck, N.D.)
NFL Team: Commanders
Stats: 16 for 26, 234 yards, 2 touchdowns
Opponent: Minot, 40-14 win
Date: Oct. 1, 2010
234 — Ryan Tannehill, Big Spring (Texas)
NFL Team: Titans
Stats: 16 for 29, 234 yards, 1 touchdowns; 15 carries, 90 yards rushing, 3 touchdowns
Opponent: Chapin (El Paso), 62-43 loss
Date: Nov. 19, 2005
225 — Trey Lance, Marshall (Duluth, Minn.)
NFL Team: 49ers
Stats: 11 for 14, 225 yards, 2 touchdowns
Opponent: Worthington, 56-0 win
Date: Sept. 15, 2017
198 — Matt Ryan, William Penn Charter (Philadelphia)
NFL Team: Colts
Stats: 10 for 14, 198 yards, 3 touchdowns
Opponent: Episcopal, 21-6 win
Date: Nov. 1, 2002
185 — Mac Jones, Bolles (Jacksonville, Fla.)
NFL Team: Patriots
Stats: 10 for 15, 185 yards
Opponent: Lake Mary, 49-29 win
Date: Aug. 28, 2015