Wasatch 100 Course

Weather is about as good as mid-November gets in the Wasatch. Highs of 53-55°F Wednesday and Thursday with light winds and full sun — no heat risk, no thunderstorm exposure, no precipitation. These are your best days. Use them for your longest efforts. Friday shifts: partly sunny with an 18% chance of light rain during the day, then 88% precipitation Friday night with winds picking up to 12 mph SE. If you're out late Friday or planning an overnight push into Saturday, expect wet trail conditions and temps dropping to the mid-30s. That's not dangerous, but footing on dirt singletrack gets slick fast when it's wet and near freezing.

Daylight is the real constraint here. You've got 10 hours and 4 minutes from sunrise to sunset, with the sun up at 7:10 AM and down at 5:13 PM. For context, the Wasatch 100 course covers serious mountain terrain — if you're linking big segments, rough math says you need to be moving by 7:15-7:30 AM to have any buffer before dark. Golden hour starts at 4:33 PM, so nav gets tricky fast after that. Build your turnaround times around being back in familiar terrain or at a trailhead by 4:30 PM. Headlamp is obvious, but on these short days it shouldn't be a backup — it should be an expectation on any run over 4-5 hours.

No snow on the ground at any of the SNOTEL stations, including Annie Springs at 6,021 ft. Upper course terrain is dry. No avalanche concern. Nights are dropping to the mid-30s, which means any shaded north-facing sections at elevation could have frost or ice patches in the early morning — watch your footing in the first hour until the sun hits those zones.

Stream crossing data in the raw feed is from California gauges and doesn't apply here — ignore the CAUTION flag on crossings, it's a data mismatch. No active fires within 50 miles. This is a clean window: go hard Wednesday and Thursday, keep Friday light or use it as a rest/travel day ahead of the rain.