Grindstone Quarry Trail
Trail features
Hover or long-press a feature to see its basis. Effort is computed from length and climb and is not an official difficulty.
Plan your visit
Access details come from OpenStreetMap tags and can be missing or out of date.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 | 1.42 micomputed |
|---|---|
| Route type | Unknownunknown |
| Surface | Dirtfrom source |
| Difficulty | Unknownunknown |
| Elevation gain | 258 ftcomputed |
| Elevation loss | 41 ftcomputed |
| Highest point | 5,971 ftcomputed |
| Lowest point | 5,707 ftcomputed |
| Estimated duration | about 35 min one way (estimate, Naismith's rule)computed |
| Official verification | Not verified by an official sourceunknown |
Elevation
Length is measured from the route geometry in the source data, so it can differ from signed or official distances.
Nearby trails
- Skills Loop0.36 mi · 0.1 mi away
- Overland Loop Trail2.20 mi · 0.1 mi away
- Schoolhouse Loop0.99 mi · 0.2 mi away
- Lichen Loop Trail1.21 mi · 0.8 mi away
Along the way
Trailhead and facilities
Parking and toilets shown are within about 0.25 mi of the trail start.
Points come from OpenStreetMap contributors and can be missing, moved or out of date. How we label data.
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.
Frequently asked questions
How long is Grindstone Quarry Trail?
Grindstone Quarry Trail in Boulder County is 1.42 mi long, measured from its route geometry in OpenStreetMap data. Signed or official distances can differ.
How much elevation does Grindstone Quarry Trail gain?
Walking from the start to the end as drawn, it climbs about 258 ft and descends about 41 ft, between 5,707 ft and 5,971 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 Grindstone Quarry Trail?
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 Grindstone Quarry Trail take?
About 35 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 Grindstone Quarry Trail start?
The route starts near 40.1361, -105.2980 (Boulder County). Use the Directions button to open it in your maps app.
Are dogs allowed on Grindstone Quarry Trail?
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 Grindstone Quarry Trail?
Mapped in OpenStreetMap near this trail: 0 water points, 2 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.
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.