Longs Peak – Keyhole Route

The weather is your primary problem, not the snowpack. The NWS forecast shows snow showers with a 47% chance today, climbing to 69% tonight, then 89-94% probability every period through Monday night — that's essentially continuous snowfall for the back half of your trip. Surface winds run 8-16 mph SSW through the window, which translates to roughly 25-30 mph at the Keyhole (13,150 ft) and likely higher on the exposed Narrows traverse and Homestretch above 13,500 ft. Combined with active snowfall, you're looking at limited visibility, spindrift, and fresh unconsolidated snow on the most technical sections of the route during any Sunday or Monday summit attempt.

Avalanche danger is Low across all elevation bands — clean bulletin, zero problems identified by CAIC. This is legitimately good news for the Keyhole approach and the bowl sections below the Keyhole. The Long Lake SNOTEL (840 ft, noting this elevation seems anomalous in the data but shows 95 inches depth and 39.7 inches SWE trending falling) indicates a deep, settled snowpack that's consolidating, not destabilizing. No new loading concerns right now. That said, once tonight's cycle adds accumulation on top of a settled base with active wind, watch for small wind slabs forming on lee aspects above the Keyhole — specifically the east-facing terrain on the upper mountain. These won't be CAIC-reportable at Low danger, but fresh wind-deposited snow on the Narrows or Homestretch adds a real technical hazard independent of avalanche risk.

Today's window — before tonight's heavier snow arrives — is your best shot. Sunrise is 6:10 AM, giving you nearly 14 hours of daylight. A pre-dawn start from the Longs Peak Trailhead targeting the Keyhole by mid-morning and summit by noon gets you off the exposed upper mountain well ahead of any afternoon convective enhancement and before tonight's loading begins. Temperatures drop to 29°F tonight and 27°F Monday night — manageable, but add wind chill from 25-30 mph ridge winds and the Narrows becomes a serious cold exposure environment.

If you're already committed to a multi-day objective and get pinned by weather, use Sunday and Monday for acclimatization and camp management below treeline. Don't push for the summit in a 90%+ precip environment with active wind loading on the upper route — the technical sections above the Keyhole become a different climb under those conditions. Watch for any break in the pattern Monday afternoon, but based on current data, this cycle holds through the end of your trip window.