Mount St. Helens

Cascade Range, Washington · 8,363 ft

What it asks of you

Skills

• Sustained snow climbing
• Crampon and ice axe movement when conditions require
• Self-arrest
• Winter navigation and descent
• Avalanche, cornice and changing-snow assessment

What these numbers assume

• Worm Flows winter route from Marble Mountain Sno-Park rather than the summer Monitor Ridge route
• The route source reports about 10 miles round trip and 5,563 ft of gain
• Pack, weekly vertical, activity and VO2 max ranges are TrekReady editorial planning targets
• Equipment and hazards change with live conditions; this profile does not replace current route, avalanche, weather or permit checks

Reviewed routes

Season

Snow-route context: generally November through late June

Worm Flows is open year-round, but seasonal access, snow, avalanche, cornice and climbing conditions require a current check

Sources

• Mount St. Helens Institute — climbing routes ↗
• Mount St. Helens Institute — climbing permits and safety ↗

Reviewed 2026-08-30. Dates reflect operator review, not current route conditions — check conditions before you go.