Longs Peak – Keyhole Route

The biggest issue here is the missing weather data. Longs Peak summit sits at 14,259 ft and the Keyhole Route above 13,000 ft is fully exposed to ridgeline winds — which typically run 1.5–2x whatever the surface forecast shows. April is a volatile month on the Front Range: afternoon thunderstorms, rapid wind shifts, and temperature swings of 30–40 degrees between trailhead and summit are all normal. Before you leave the car, pull the NWS forecast for Rocky Mountain National Park high elevations and check the NOAA point forecast at the summit coordinates. If summit winds are forecast above 30–35 mph or any convective activity is possible after 10 AM, adjust your turnaround time accordingly. The standard Keyhole summit window is early — start by 3–4 AM, be off the Narrows and Homestretch by noon at the absolute latest.

The avalanche picture is excellent. CAIC is calling Low (1/5) across all elevation bands — above treeline, near treeline, below treeline — with zero identified problems. The snowpack in the Long Lake station (closest proxy at depth) shows 102 inches with SWE trending down, meaning consolidation and settlement, not loading. There's nothing in the bulletin suggesting instability anywhere on the Keyhole Route approach or descent. Move freely through avalanche terrain on this one.

Snowpack at elevation in April means the Trough, Narrows, and Homestretch will likely have consolidated névé or ice depending on aspect and recent temperatures. North and east-facing sections above 13,000 ft can hold hard snow or verglas well into May. Crampons and an axe are mandatory — not precautionary, mandatory. The Homestretch in particular becomes a serious fall hazard on hard morning snow before solar softening. If you're hitting the summit before 8–9 AM (which you should be), expect firm-to-hard conditions on that final headwall.

Stream crossing data shown here is from California gauges and is not relevant to this route — disregard it. The Longs Peak trailhead approach has no significant stream crossings. With 13+ hours of daylight and a 3–4 AM alpine start, you have a generous weather window if the forecasts cooperate. Get the NWS data tonight, check the CAIC morning update day-of, and build your turnaround time around summit wind speeds, not distance.