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iR
iRacing Calendar
2026 Season 4

Prototype Challenge - 2026 Season 4 - Fixed

Sports Car
12 weeks
Week 1 active
Car: Porsche 963 GTP, BMW M Hybrid V8 (Evo), Ferrari 499P, Aston Martin Valkyrie AMR-LMH, Cadillac V-Series.R GTP, Acura ARX-06 GTP
Drops: 4
Class C 4.0 --> Pro/WC 4.0Races every 2 hours at :00

Season Timeline

Week 1Week 12

Full Schedule

1

Indianapolis Motor Speedway - Road Course

Sep 15 — Sep 2120 min

74°F/24°C, Rain chance None, Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

2

Road Atlanta - Full Course

Sep 22 — Sep 2820 min

81°F/27°C, Rain chance None, Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

3

Fuji International Speedway - Grand Prix

Sep 29 — Oct 520 min

67°F/20°C, Rain chance 25% (2% before session), Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

4

Red Bull Ring - Grand Prix

Oct 6 — Oct 1220 min

66°F/19°C, Rain chance Slight (None before session), Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

5

Long Beach Street Circuit

Oct 13 — Oct 1920 min

71°F/22°C, Rain chance None, Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

6

Circuit Gilles Villeneuve

Oct 20 — Oct 2620 min

66°F/19°C, Rain chance Slight (None before session), Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

7

Circuit des 24 Heures du Mans - 24 Heures du Mans

Oct 27 — Nov 220 min

67°F/20°C, Rain chance 4% (2% before session), Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

8

Autódromo Hermanos Rodríguez - Grand Prix

Nov 3 — Nov 920 min

72°F/22°C, Rain chance None, Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

9

Suzuka International Racing Course - Grand Prix

Nov 10 — Nov 1620 min

67°F/19°C, Rain chance 98% (99% before session), Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

10

Silverstone Circuit - Grand Prix

Nov 17 — Nov 2320 min

65°F/19°C, Rain chance 2% (8% before session), Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

11

Sebring International Raceway - International

Nov 24 — Nov 3020 min

81°F/27°C, Rain chance None, Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate

12

Autodromo Nazionale Monza - Grand Prix

Dec 1 — Dec 720 min

66°F/19°C, Rain chance None, Forecast regenerated for each race, Rolling start, Local enforced cautions, Qual scrutiny - Moderate