Cascade Pass & Sahale Arm

The snowpack is the dominant factor on this trip. At 31 inches of depth this late in May, Sahale Arm will be heavily snow-covered above the treeline. The approach through Cascade Pass will likely be manageable boot track, but the arm itself climbs into steep terrain where consolidated spring snow can be slick and unforgiving, especially on the descent. The NWAC bulletin has no rating and no identified problems — the seasonal transition means formal avalanche forecasting has ended — but their discussion explicitly flags watching for recent avalanches, cracking, and collapsing. In late May with daytime highs near 50°F, the south-facing slopes on the arm will soften mid-afternoon and firm back up hard overnight into the mid-30s. Plan your moves on steep snow for the morning window, before solar warming peaks. An ice axe and microspikes are worth the weight given the terrain above 5,500 feet.

Weather is a genuine asset through Saturday. Today is sunny with a light WNW breeze topping out around 15 mph — perfect travel conditions. Saturday brings partly sunny skies with winds building to 24 mph W, which is workable but noticeable on the exposed arm. Saturday night drops to 34°F with SW winds — that's a cold camp if you're sleeping on snow at elevation, so site selection matters. Sunday stays partly sunny with a slight precipitation chance (13%), but Sunday night flips to rain and snow showers likely at 59% — that's your exit signal. Plan to be descending or already out by Sunday afternoon.

Stream crossings are a non-factor. The five monitored gauges are all at or near normal seasonal flows with stable to falling trends, and there are no active fires within 50 miles. Air quality will be clean.

With 15.5 hours of daylight, you have enormous flexibility on timing. Use it — start your Sahale Arm push early (sunrise is 5:16 AM) to maximize morning snow stability, get your high camp established before the afternoon softening, and build your Sunday exit around getting off snow before the evening precip moves in.