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Best Time for the Yellowstone & Grand Teton
Sweet spot: March, April, May — computed from NASA POWER climate normals across the route's overnight towns, balancing temperature, rainfall and daylight.
Snow lingers on high passes into early June while wildlife babies appear — pack layers for 25°C days and freezing dawns.
Most park roads close to cars — winter access is by snowcoach or ski; the loop as driven here doesn't run.
| Month | Temp | Rain | Daylight | |
|---|---|---|---|---|
| January | -34.5–0.3°C | 77 mm | 9.1 h | ❄ |
| February | -35.8–0.4°C | 68 mm | 10.2 h | ❄ |
| March | -30.0–11.0°C | 70 mm | 11.6 h | ❄ |
| April | -22.8–19.4°C | 74 mm | 13.2 h | ❄ |
| May | -14.3–24.5°C | 73 mm | 14.6 h | ❄ |
| June | -5.4–28.3°C | 62 mm | 15.3 h | ❄ |
| July | -1.2–33.4°C | 32 mm | 15.0 h | ❄ |
| August | -1.8–32.4°C | 36 mm | 13.8 h | ❄ |
| September | -7.1–28.5°C | 49 mm | 12.3 h | ❄ |
| October | -20.5–23.2°C | 63 mm | 10.8 h | ❄ |
| November | -29.7–13.0°C | 72 mm | 9.4 h | ❄ |
| December | -34.5–1.8°C | 85 mm | 8.7 h | ❄ |