Yost Creek and Fern Lake Trailhead
Trailhead · Yosemite corridor
Yost Creek and Fern Lake Trailhead sits at 7352 feet in the Yosemite corridor, offering alpine creek and lake access with moderate exposure to afternoon wind.
Wind rises predictably by mid-afternoon as thermal currents build off surrounding slopes. Morning conditions are notably calmer; expect 8 mph average wind across rolling 30 days. Temperature hovers around 35 degrees Fahrenheit in the 30-day average, climbing sharply only in late summer. Plan creek work and exposed travel for dawn hours.
Over the last 30 days, the average NoGo Score held at 17 (a moderate baseline for this elevation). Wind averaged 8 mph but spiked to 29 mph on worst days; temperatures averaged 35 degrees Fahrenheit. The week ahead will show whether afternoon heating continues to drive the typical wind pattern. Monitor the chart for score spikes tied to wind events.
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About Yost Creek and Fern Lake Trailhead
Yost Creek and Fern Lake Trailhead is a moderate-traffic gateway in the Yosemite corridor, accessed via Highway 120 from the west or Tioga Road from the east. The trailhead sits at 7352 feet on the eastern Sierra flank, feeding alpine creeks and meadow lakes typical of the high-country transition zone. Parking is limited; arrive before 9 a.m. on weekends to secure a spot. The drive from Tuolumne Meadows takes roughly 45 minutes; from Groveland, allow 90 minutes. Snow closes Highway 120 typically from November through May, making this site inaccessible outside the summer to early autumn window.
Conditions at the trailhead are driven by elevation and orientation. The 30-day average temperature of 35 degrees Fahrenheit reflects spring-into-early-summer timing; by midsummer, daytime highs reach the low 50s, cooling rapidly after sunset. Wind averages 8 mph but climbs to 29 mph in gusts when thermal heating accelerates afternoon flow. Morning calm persists until mid-morning; skip the afternoon if you're working exposed terrain or paddling on adjacent water bodies. Crowding averages 13 across the rolling 30-day window, rising sharply the first weekend after the highway opens for the season. Summer holidays and the initial post-closure weekend generate parking gridlock.
This trailhead suits backpackers, day hikers, and creek anglers willing to start early and finish by mid-afternoon. Experienced visitors plan around afternoon wind; a calm morning session beats a windy afternoon scramble. The elevation and snow-fed drainage make water cold year-round; thermal wear and insulating layers are mandatory even in July. Cell service is spotty; download maps offline. Parking is first-come, first-served; no reservations. The site is best for self-sufficient groups comfortable with untracked terrain and minimal facilities.
Nearby alternatives include Cathedral Lakes and Glen Aulin, both accessible from the same corridor but with different exposure profiles. Cathedral Lakes sits more sheltered from thermal afternoon wind; Glen Aulin drains a larger basin and holds higher flow. Tenaya Lake, 30 minutes northwest, offers a higher base popularity and more developed infrastructure but identical wind risk. For creek work specifically, Yost Creek's proximity and lower crowding make it the choice over busier drainages closer to valley trailheads.