John Muir Trail
Sierra Nevada, CA
Elevation Profile
Current Conditions
Bottom Line
Solid conditions for a May JMT trip. Afternoon thunderstorm risk today and Sunday — plan your exposed ridge and pass crossings for morning. Stream flows are at or below median across all gauges, so crossings shouldn't be an issue.
64°/42°F · Chance Showers And Thunderstorms
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31" depth
Normal flows · 5 gauges
No active fires within 50 miles
14h 24m daylight · Sunrise 5:41 AM · Sunset 8:04 PM
Full Briefing
The biggest thing to manage this trip is afternoon convective activity. Today has the highest storm probability at 28%, with another window Sunday at 20%. Both days, the pattern is classic Sierra — mornings clear out, instability builds by early afternoon. If you're crossing any exposed passes or above-treeline sections, be off the high points by noon. Saturday is your gift day: sunny, 64°F, winds 5–15 mph S, essentially zero precip. Use it for your most committing terrain.
Stream crossings are a non-issue right now. All five USGS gauges are at or below median — Salinas near Bradley is exactly at 103%, everything else is trending stable or falling. With 31 inches of snowpack still on the ground at elevation, flows could bump slightly during peak afternoon melt on warm days, but you're nowhere near the 150% threshold where crossings get sketchy. Cross earlier in the day if you want extra margin, but this isn't a season where you're gambling on swollen creeks.
Snowpack at 31 inches means you'll likely hit snow on north-facing slopes and above roughly 10,000 feet. The SNOTEL picture here is a bit noisy — the relevant on-trail depth is that 31-inch figure, and with overnight lows in the low-to-mid 40s, the snow surface will be soft by midday. Morning travel on snow will be firmer and faster. Microspikes are worth carrying for icy morning conditions on shaded traverses, especially if you're moving early to beat the afternoon weather.
No fires within 50 miles, so air quality is clean. You've got 14.5 hours of daylight with sunset at 8:04 PM — plenty of buffer. Get your miles in during the morning window, find camp by mid-afternoon on storm days, and make the most of Saturday when the Sierra is likely to be spectacular.
Waypoints
Happy Isles Trailhead
Start from Happy Isles in Yosemite Valley. Permit required.
3,999 ft
Tuolumne Meadows
Major resupply point. Tuolumne Meadows store and post office.
8,599 ft
Muir Pass
One of the highest passes on the JMT. Historic Muir Hut at the summit.
11,998 ft
Forester Pass
Highest point on the JMT/PCT at 13,153 feet. Snow through late July.
13,153 ft
Mount Whitney Summit
Southern terminus. Highest point in the lower 48 at 14,505 feet.
14,505 ft
Route Details
Distance
210.9 mi
Elevation Gain
43,999 ft
Elevation Loss
45,000 ft
Max Elevation
13,153 ft
Estimated Days
21
Trailhead
Happy Isles Trailhead (Yosemite Valley)
Best Season
Late July through September. Snow on passes in early July. Permits extremely competitive—apply early.
Permit Required
Yosemite wilderness permit required. Whitney Portal permit separate. Both through recreation.gov.
About This Route
The John Muir Trail is one of the most celebrated long-distance trails in the United States, spanning 211 miles from Yosemite Valley to the summit of Mount Whitney through the heart of the Sierra Nevada. The trail traverses some of the most spectacular mountain scenery on the continent—granite peaks, crystalline lakes, flower-filled meadows, and deep river canyons. Most thru-hikers complete the JMT northbound (Whitney to Yosemite) in 17-25 days. The trail crosses 11 major passes above 11,000 feet, with the highest being Forester Pass at 13,153 feet. Snow lingers on north-facing slopes and passes well into July, making late July through September the sweet spot for most hikers. Permits are required and highly competitive. Yosemite trailhead quotas fill within minutes when released six months in advance. Whitney Portal permits require a separate lottery. Many hikers avoid the permit crunch by starting from Tuolumne Meadows or another interior Yosemite trailhead. Food canisters are required throughout much of the route. Bears are common, water sources are abundant but all require treatment, and afternoon thunderstorms are frequent in August. The JMT is a transformative wilderness experience that rewards careful planning.
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