FOUR JEFFREY
Campground · Eastern Sierra corridor
FOUR JEFFREY sits at 9790 feet in California's Eastern Sierra, a high-elevation campground exposed to afternoon wind but calmer on early mornings and sheltered dawns.
Wind averages 11 mph but regularly gusts to 38 mph by mid-afternoon, funneling down the drainage. Mornings are substantially calmer. At this elevation, temperatures average 28 degrees Fahrenheit across the 30-day window, making spring and early summer the only practical camping seasons.
Over the last 30 days, FOUR JEFFREY averaged a NoGo Score of 14.0 with wind running 11 mph and temperatures holding near 28 degrees Fahrenheit. The week ahead follows the same high-elevation pattern: expect calm mornings, afternoon wind, and cold nights typical of the 9790-foot band. Plan around the 7-day forecast and watch for wind spikes.
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About FOUR JEFFREY
FOUR JEFFREY is a high-Sierra campground in the Eastern Sierra corridor, positioned at 9790 feet on the eastern flank of the Sierra Nevada. Access is via Highway 395 south from Mammoth Lakes or north from Bishop; the final approach is a dirt road passable only when snow clears, typically late May or early June. The site sits in a drainage basin that funnels wind from the north and west by mid-afternoon, making it a seasonal-only destination. Base popularity is low, meaning crowds are rare even during peak summer weeks.
Temperature and wind are the dominant seasonality drivers. The 30-day average temperature is 28 degrees Fahrenheit, with a rolling 365-day minimum of 11 degrees and maximum of 41 degrees. Winter and early spring are closed by snow; the site does not reliably open until late May. From late June through early September, temperatures climb into the 30s to low 40s, and wind averages 11 mph with gusts to 38 mph common by afternoon. By October, freezing nights return and the road becomes unreliable. The 30-day average crowding score is 7.0, reflecting minimal use.
FOUR JEFFREY suits car campers, backpackers staging trips into the high Sierra, and anglers targeting nearby alpine lakes. Plan for afternoon wind by pitching camp in the morning or early afternoon, before gusts intensify. Bring cold-weather gear; nights drop well below freezing even in summer. The campground offers no services; water and supplies must come from Mammoth Lakes or Bishop. Parking is limited and first-come; arrive early on weekdays to secure a site.
The Eastern Sierra corridor includes Inyo National Forest and numerous trailheads within a short drive. Mammoth Lakes, 30 miles north, offers full services and is the primary staging hub. Bishop, 40 miles south, provides an alternative resupply point. Both towns sit at much lower elevation and are substantially warmer. Visitors planning multi-day Sierra trips often use FOUR JEFFREY as a layover base but rarely camp there for extended stays due to cold nights and exposure. The nearby Inyo Craters and June Lake Loop are accessible alternatives at lower elevations with less afternoon wind.