3,442 ft · Willey Range · month-by-month from 251 observed days
3,442 ft | Willey | 1 route
May through September is the reliable window: 96% of observed days rated Good or Moderate. March was the toughest month, with 72% of days at Difficult or worse.
Bar shows the share of observed days at each severity; the number is the share rated Good or Moderate. Good · Moderate · Difficult · Dangerous
| Month | Days observed | Good/Moderate | Recurring hazards |
|---|---|---|---|
| February | 27 | 48% | severe wind chill, ice, snow, dangerous wind |
| March | 29 | 28% | ice, snow, severe wind chill |
| April | 30 | 53% | ice, mud, snow, severe wind chill |
| May | 31 | 81% | mud, ice, slick ledges, severe wind chill |
| June | 30 | 100% | mud, slick ledges, severe wind chill, ice |
| July | 31 | 100% | mud, slick ledges, severe wind chill |
| August | 31 | 100% | mud, slick ledges, ice |
| September | 30 | 100% | mud, slick ledges, ice, severe wind chill |
| October |
Right now on Mount Avalon
Difficultupdated Oct 17, 3 AMMay through September is the reliable window: 96% of observed days rated Good or Moderate. March was the toughest month, with 72% of days at Difficult or worse.
Yes, with winter gear and experience: in our observations, 63% of December-March days rated Difficult or Dangerous. Full winter traction, insulation, and a hard turnaround plan are the baseline; check live conditions the morning you go.
Methodology: severity shares are observed, not forecast. Each day's rating is the consensus of our AI-synthesized condition reports for Mount Avalon that day, collected since February 2026 (251 days so far). Months keep filling in as the archive grows. Pair the history with the live report and a summit forecast before you commit to a drive.
| 12 |
| 100% |
| slick ledges, ice, severe wind chill, dangerous wind |