USFS National Forest System Trails · Pike and San Isabel National Forests · Colorado · Updated June 2026
South Halfmoon 4wd Trail (USFS trail 110.J) is a 4.7 mi trail in Pike and San Isabel National Forests, Colorado. Mountain-bike use here is accepted but discouraged in USFS data, with Class 1 e-bikes also designated.
Can I bike South Halfmoon 4wd Trail?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Accepted but discouraged | — |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | year-round |
| Class 2 e-bike (throttle, 20 mph) | Allowed | year-round |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | year-round |
Zooming out: across Pike and San Isabel National Forests, 51% of rideable trail miles are open to mountain bikes — a Bike Access Grade of B.
Watch Pike and San Isabel National Forests for access changes
Email me when USFS mountain-bike or e-bike designations change for trails in Pike and San Isabel National Forests. Free, unsubscribe anytime.
About this trail
South Halfmoon 4wd Trail (USFS trail 110.J) runs 4.7 mi through Pike and San Isabel National Forests in Colorado. Everything below comes straight from the US Forest Service National Forest System Trails dataset — length, surface, slope-derived difficulty, and the specific bike and e-bike designations on record — so you can check legality before you load up. The trail surface is not specified in the USFS record. No grade band is recorded, so a steepness-based difficulty isn't available for this trail. For traditional mountain bikes, use is discouraged according to USFS data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated — Class 1 being pedal-assist only, Classes 2 and 3 adding a throttle and higher assisted speed. Its USFS Trail Class (the agency's 1-to-5 development rating) isn't recorded for this segment. Treat this as a planning reference rather than a live conditions report, and verify any time-sensitive closure or order with the ranger district that manages Pike and San Isabel National Forests.
Frequently asked questions
- Can you mountain bike on South Halfmoon 4wd Trail?
- Mountain-bike use on South Halfmoon 4wd Trail is discouraged in USFS records, though Class 1 e-bike use is designated. Confirm current rules with the managing ranger district.
- Are e-bikes allowed on South Halfmoon 4wd Trail?
- Class 1, Class 2, Class 3 e-bikes are designated on South Halfmoon 4wd Trail in the USFS data.
- How long is South Halfmoon 4wd Trail?
- South Halfmoon 4wd Trail measures about 4.7 mi in total, summed across its mapped National Forest System segments.
How we read this data
Grade-based difficulty above is the USFS grade (route steepness), not a technical mountain-bike rating — a gentle-grade trail can still be rocky or technical, and vice versa. Bike and e-bike status come verbatim from the USFS managed-use fields for this trail; we never infer access we can't cite. See our methodology for how the dataset is built and what each field means.
Where it is
Approximate location of Pike and San Isabel National Forests (USFS trail geometry isn't mapped).
Where to stay near Pike and San Isabel National Forests
Find hotels, cabins, and vacation rentals near Pike and San Isabel National Forests — plan your ride.
Top-rated places to stay near Pike and San Isabel National Forests
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Riding Pike and San Isabel National Forests?
Trail-access updates and trip ideas by email.