Thunder Lake Trail

Schematic preview drawn from the trail geometry. No basemap yet; do not use for navigation. Start = circle, end = square.

Length4.46 micomputed

Route typeUnknownunknown

SurfaceUnknownunknown

DifficultyUnknownunknown

Est. time2 hr 20 mincomputed

Elevation gain1,767 ftcomputed

Plan your visit

No bikesNo horses

Access details come from OpenStreetMap tags and can be missing or out of date. Fees, permits and seasonal closures are not included here yet.

Parking, fees and permits

We don't have verified parking, fee or permit details for this trail, so they are unknown here. These rules change and are set by the land manager. Check the official pages:

Details

Length	4.46 micomputed
Route type	Unknownunknown
Surface	Unknownunknown
Difficulty	Unknownunknown
Elevation gain	1,767 ftcomputed
Elevation loss	103 ftcomputed
Highest point	10,667 ftcomputed
Lowest point	8,891 ftcomputed
Estimated duration	about 2 hr 20 min one way (estimate, Naismith's rule)computed
Official verification	Not verified by an official sourceunknown

Elevation

Elevation along the trail from start (left) to end (right) as drawn. Values are computed from USGS 3DEP 1/3 arc-second DEM (public domain), sampled about every 10 m and smoothed. Walking the other way reverses the climbs and descents.

Length is measured from the route geometry in the source data, so it can differ from signed or official distances.

Nearby trails

Weather at the trailhead

Sat61° / 37°Sunny0% precip

Sun61° / 37°Mostly Sunny0% precip

Mon59° / 37°Partly Sunny8% precip

Tue60° / 39°Mostly Sunny7% precip

Wed62° / 40°Mostly Sunny4% precip

Thu63° / 39°Partly Sunny then Chance Rain Showers37% precip

Fri59° / –Rain And Snow Showers Likely59% precip

Today: sunrise 7:14 AM, sunset 6:19 PM (computed from the trailhead location).

Forecast for the trailhead area from the U.S. National Weather Service, updated Oct 17, 12:46 AM. Mountain weather changes fast and can differ a lot by elevation: check the official forecast for your route before you go.

Recent conditions

Reports come from Arête members, not from land managers. They show when something was seen, not whether it is still true. Check official sources before you go.

No condition reports in the last 30 days. Conditions are unknown, not necessarily good.

Reviews

No reviews yet.

Source

© OpenStreetMap contributors (ODbL). Overpass API extract: Boulder County, CO (hiking relations + named paths). Licence: ODbL 1.0. Data version osm-2026-10-16, imported 10/16/2026. View the source record

Trail data can be wrong or out of date, and Arête is not an emergency service. Check official sources, weather and closures before you go.

Directions