Hidden Valley
Boulder Open Space and Mountain Parks · 1.50 mi one way · 104 ft of descent as drawn · about 30 min
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Overview
Hidden Valley is mapped as a trail of 1.50 mi in Boulder Open Space and Mountain Parks. It is not a loop: you walk it one way or out and back.
It runs between 5,471 ft and 5,574 ft above sea level, a difference of 103 ft.
As drawn it is downhill one way: 104 ft of descent. Walked the other way the climb and descent swap.
The mapped surface is ground.
Estimates
- Computed effort band: easy (from length and climb; not an official difficulty).
- Estimated time 30 min one way by Naismith's rule, which assumes steady walking and adds time for climbing. Real time varies.
Before you rely on this
- No water source is mapped for this trail. That may only mean nobody has mapped one, so carry your own water.
- Check the land manager for closures, seasonal rules and permits before you go; none of that is verified here.
Elevation
Hover, tap, or use the arrow keys on the chart to read a point; it is shown on the map too.
Before you go
- Parking
- No parking is mapped near the start. not verified
- Trailhead and directions
- Start at 40.07646, -105.27745. Directions to the start ↗
- Permits and fees
- We have no verified permit or fee details. Official pages: Boulder Open Space and Mountain Parks ↗, Boulder ↗, Boulder County ↗. not verified
- Dogs
- No dog rule is tagged. not verified
- Water
- No water is mapped. Carry your own. not verified
- Toilets and facilities
- None mapped. not verified
- Accessibility, bikes and horses
- Bikes allowed · Horses allowed mapped by OpenStreetMap contributors
- Seasonal rules, closures and hazards
- Not verified here. Check the land manager (Boulder Open Space and Mountain Parks ↗) and read the hiker condition reports below. No report does not mean the trail is open or safe. not verified
Weather at the trailhead
Today: sunrise 7:13 AM, sunset 6:18 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.
Photos and places from hikers
Added by community members and checked by our team before they appear. Photos have their location data removed. These are not official information.
No approved photos or places yet.
Nearby trails
Data, sources and how the numbers are made
| Length | 1.50 micomputed |
|---|---|
| Route type | Not a loopunknown |
| Surface | Groundfrom source |
| Difficulty | Unknownunknown |
| Elevation gain (as drawn) | 22 ftcomputed |
| Elevation loss (as drawn) | 104 ftcomputed |
| Estimated duration | about 30 min one way as drawn (Naismith's rule)computed |
| Official verification | Not verified by an official sourceunknown |
Length is measured from the route geometry in the source data, so it can differ from signed or official distances. Gain and loss describe the direction the line is drawn; the route view above shows the other direction and out and back. Elevation is computed from USGS 3DEP 1/3 arc-second DEM (public domain), sampled about every 10 m and smoothed.
© OpenStreetMap contributors (ODbL). Overpass API extract: Boulder County, CO (hiking relations + named paths). Licence: ODbL 1.0. Data version osm-2026-10-16, imported 10/17/2026. View the source record
Frequently asked questions
How long is Hidden Valley?
Hidden Valley in Boulder Open Space and Mountain Parks is 1.50 mi long, measured from its route geometry in OpenStreetMap data. Signed or official distances can differ.
How much elevation does Hidden Valley gain?
Walking from the start to the end as drawn, it climbs about 22 ft and descends about 104 ft, between 5,471 ft and 5,574 ft. These are computed from the USGS 3DEP elevation model and can differ from other apps; the other direction swaps climbing and descending.
How hard is Hidden Valley?
Difficulty is unknown: no source we use rates this trail, and we don't guess. Use the length and elevation gain to judge it for yourself.
How long does Hidden Valley take?
About 30 min one way for a fit hiker, by Naismith's rule from the length and climb. It is an estimate: allow more for rest, photos, heat, altitude and weather.
Where does Hidden Valley start?
The route starts near 40.0765, -105.2774 (Boulder Open Space and Mountain Parks, Boulder, Boulder County). Use the Directions button to open it in your maps app.
Are dogs allowed on Hidden Valley?
Not tagged in OpenStreetMap, so it is unknown. Check posted signs and the land manager's website.
Is there water, parking or a toilet at Hidden Valley?
Mapped in OpenStreetMap near this trail: 0 water points, 0 parking areas, 0 toilets. Mapped water is not tested or guaranteed: carry your own. Fees and permits are not included here; check the official page.
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.