Mount Jefferson is a serious outing year-round in our observations: no month cleared 60% Good-or-Moderate days. July was the most forgiving at 45%.
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 |
|---|---|---|---|
| January | 31 | 0% | dangerous wind, severe wind chill, ice |
| February | 28 | 0% | severe wind chill, dangerous wind, ice, snow |
| March | 29 | 0% | dangerous wind, severe wind chill, ice, snow |
| April | 30 | 7% | ice, dangerous wind, severe wind chill, slick ledges |
| May | 31 | 6% | dangerous wind, severe wind chill, ice, snow |
| June | 30 | 30% | severe wind chill, dangerous wind, slick ledges, ice |
| July | 31 | 45% | dangerous wind, severe wind chill, slick ledges |
| August | 31 | 39% | dangerous wind, severe wind chill, slick ledges, mud |
Right now on Mount Jefferson
Difficultupdated Nov 13, 12 PMMount Jefferson is a serious outing year-round in our observations: no month cleared 60% Good-or-Moderate days. July was the most forgiving at 45%.
Yes, with winter gear and experience: in our observations, 100% 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.
One email when the first widespread ice reports come in from the Whites, with what to bring. Then the Thursday conditions outlook each week.
Methodology: severity shares are observed, not forecast. Each day's rating is the consensus of our AI-synthesized condition reports for Mount Jefferson that day, collected since December 2025 (320 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.
| September |
| 30 |
| 33% |
| severe wind chill, dangerous wind, slick ledges |
| October | 31 | 13% | severe wind chill, dangerous wind, ice |
| November | 9 | 0% | severe wind chill, dangerous wind, ice, slick ledges |
| December | 9 | 0% | severe wind chill, dangerous wind, ice |
5,712 ft · Presidential Range · month-by-month from 320 observed days
5,712 ft | Presidential | 2 routes