Tahoe Rim Trail

Weather window for this trip is about as clean as it gets for late May in the Sierra. Highs of 78-81°F with sunny skies all three days, overnight lows holding in the low 50s, and winds staying light — mostly 5-15 mph SW/W. No precipitation in the forecast through Sunday night (1% or less each night). You'll have 14.5 hours of daylight with sunset at 8:12 PM, so there's no pressure on timing from a light standpoint.

Snowpack at the TRT's elevation band is the one thing worth watching. The Long Lake SNOTEL at 840 ft still shows 61 inches depth and 26.4 inches SWE with a falling trend — that's a low-elevation station and the falling trend reflects active melt. Annie Springs at 6,021 ft is already at zero depth. The TRT runs roughly 6,300-9,000 ft, so expect patchy snow on north-facing aspects above 7,500 ft, with wet, soft conditions on those same aspects in the afternoon. The warm nights (lows in the 50s) mean snowmelt won't shut off overnight, so north-aspect snow will be sloppy all day. Plan your mileage to cross any snowy north-facing traverses in the morning when the surface is firmer.

Stream crossings are not a concern. The five gauges in the region are all at or below median flows — Salinas at 103%, Llagas at 100%, Alameda trending down at 69%. No gauges are approaching the 150% threshold where crossings get tricky. Water availability along the route should be good given the residual snowmelt, but treat everything — this time of year, melt is pushing surface water everywhere.

No active fires within 50 miles and no NWS warnings in effect. The light SW winds won't be pulling smoke from anywhere relevant. This is a straightforward, high-quality late-spring backpacking window. Get out early each day to take advantage of firm snow conditions if you're hitting the higher ridgeline sections, and plan camp somewhere with afternoon shade if the 80-degree temps are a factor.