California trails · Green Mountain
A 19.9-mile out-and-back in California, with 1,948 ft of climbing. Reaches Rattlesnake Lake and other lake/spring/summit destinations. Managed by the U.S. Forest Service.
The climbing leans toward the first third: 47% of the ascent falls between mile 0.0 and mile 6.6. It gives back about 4,847 ft along the way, so it rolls rather than climbing steadily.

USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Green Mountain access. About 2 h 24 min drive (87 mi, 13 of them unpaved) from Redding. 40.87702, -123.31279 · directions
On October 14, 2026 — the day this page was generated — first light reaches this trailhead at 6:55 a.m., the sun rises at 7:23 a.m. and sets at 6:34 p.m., and the last usable light fades about 7:02 p.m. (PDT) — 11 h 11 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 39.9-mile round trip works out to roughly 16 h 43 min of walking — more than a single day of daylight here, so plan it as an overnight or hike it in sections.