Wasatch 100 Course

Daylight is your primary constraint this week. Sunset at 5:22 PM gives you just over 10 hours of usable light, and November trails in the Wasatch lose warmth fast once the sun drops. If you're running a full 25–30 mile segment, that's a hard pace floor of around 20 min/mile to finish in daylight — manageable, but no room for long breaks or navigation confusion. Start no later than 7:00 AM on your big days. Bring a headlamp regardless; November sunsets can catch you earlier than expected on north-facing canyon sections.

Wednesday is the day to watch. A 51% precip chance with temps around 40°F means rain at lower elevations and snow above roughly 7,000–8,000 ft on the Wasatch 100 course. That's a wide swath of the route, including Big Mountain Pass and Desolation Lake areas. Wet snow on dirt trail at those elevations will be slick, especially on exposed traverses and shaded north-facing slopes. If you're committed to running Wednesday, keep to the lower canyon sections (below 7,000 ft) and expect slower footing. Thursday clears out to partly sunny with only 4% precip — a solid recovery window.

The stream gauge data flagged in your briefing is from California stations and doesn't apply to the Wasatch 100 corridor. Treat stream crossings as an unknown — after any precip event like Wednesday's, small drainages on the course can run higher than expected in November, so scout before committing to crossings below canyon bottoms.

Temperatures are solidly in the no-heat-stress zone all week — highs in the low-to-mid 40s, lows in the upper 20s. Hydration needs are moderate; don't underdrink just because it's cold. The bigger cold-weather issue is that 28–31°F overnight lows mean any moisture on trail — Wednesday's snow, or even heavy dew — can freeze by morning. Thursday's early miles may have icy patches on shaded sections above 7,500 ft. Today is clean, cold, and clear. Make it your priority day.