Mt. Shasta – Avalanche Gulch
Cascades, CA
Elevation Profile
Current Conditions
Bottom Line
Clean weather window Thursday–Friday with a deteriorating forecast Saturday — plan your summit bid for Friday morning at the latest. No avalanche rating is posted (spring season gap), so self-assess on the hill. Snowpack data is sparse and mostly from low-elevation stations that don't represent summit conditions.
50°/32°F · Sunny
No Rating (0/5)
52" depth
Elevated flows · 5 gauges
No active fires within 50 miles
13h 40m daylight · Sunrise 6:18 AM · Sunset 7:58 PM
Full Briefing
The weather window is the driving factor this trip. Thursday and Friday are textbook Shasta days — sunny, temps hitting 47–50°F at the surface forecast point, light winds 2–10 mph NNW/WSW, and clear overnight lows around 32–34°F. Those overnight lows are critical: they'll firm the snowpack on Avalanche Gulch for predawn crampon travel and set a solid freeze-thaw surface for the descent. Friday is your summit day. Get on the route by 2–3 AM to top out before solar warming softens the couloir.
Saturday is where it falls apart. A 51% precipitation chance with chance light snow starts Saturday and runs through Saturday night, winds picking up to 8–14 mph WSW at the surface. At summit elevation (~14,179 ft), expect surface winds closer to 20–30 mph using a 2x ridgeline multiplier, with snow and reduced visibility possible. Don't be above Red Banks on Saturday. If you're on a three-day schedule with summit day Saturday, push it to Friday or pull back to base camp and wait it out.
No avalanche bulletin is posted — the Mount Shasta Avalanche Center is in spring gap operations. That doesn't mean clean conditions, it means no professional assessment. The center's standing advisory is sound: watch for recent cracking, collapsing, or debris. In late April on Shasta, the main avalanche concern is wet slab activity on sun-exposed aspects during afternoon warming. With overnight refreezes around 32°F, the morning window should be stable. Get off the upper mountain and out of the main gulch by noon at the latest — earlier if you see surface water or hear hollow snow.
SNOTEL data is essentially useless for summit planning here — Long Lake at 840 ft showing 97 inches and Annie Springs at 6,021 ft showing no depth reading gives you nothing for the 10,000–14,000 ft zone you'll be climbing. Assume a deep, consolidated spring snowpack based on the season, but probe and self-assess as you gain elevation. Stream crossing data in this feed is entirely from central California watersheds and doesn't apply to Shasta approaches. Daylight is generous at 13h40m, but your alpine start negates most of it — carry headlamps and plan your turnaround time independent of sunset.
Waypoints
Bunny Flat Trailhead
Trailhead at Bunny Flat. Self-register for permits here.
6,791 ft
Horse Camp / Sierra Club Hut
Historic stone hut. Spring water available. Good acclimatization camp.
7,999 ft
Helen Lake
High camp at Helen Lake. Snow camping on the glacier.
10,200 ft
Red Banks
Volcanic rock band. Crux of the route. Bergschrund crossing early season.
12,999 ft
Mt. Shasta Summit
Summit at 14,179 ft. Sulfurous fumaroles near the top.
14,180 ft
Route Details
Distance
11.5 mi
Elevation Gain
7,500 ft
Elevation Loss
7,500 ft
Max Elevation
14,180 ft
Estimated Days
2
Trailhead
Bunny Flat
Best Season
May through July for best snow conditions. Later season is loose scree.
Permit Required
Summit pass ($25) and wilderness permit required. Available online or at the ranger station in Mt. Shasta city.
About This Route
Avalanche Gulch is the standard climbing route on Mt. Shasta (14,179 ft), a massive volcanic peak in northern California. The route is a non-technical snow climb but requires crampons, an ice axe, and self-arrest skills. The sheer vertical gain—over 7,000 feet from trailhead to summit—makes it one of the most demanding day climbs in the lower 48. The route ascends from Bunny Flat through the Sierra Club hut area, past Helen Lake (a common high camp), and up the steepening Avalanche Gulch to the Red Banks—a band of volcanic rock at 13,000 feet. Above the Red Banks, the route traverses Misery Hill before the final push to the summit. Alpine starts (1-2 AM) are essential to catch firm snow and avoid rockfall in the gulch. The mountain creates its own weather and can go from sunny to whiteout in minutes. A summit pass and wilderness permit are required. Wag bags are mandatory for human waste above treeline.
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