Best time to visit Joshua Tree.

Crowd score

Formula: 100 − (this month's visits ÷ park's peak month visits) × 100. Each park scored against its own peak, not against other parks.

Source: NPS Visitor Use Statistics Data Package 2025, Recreation Visits (TRV), 5-year monthly mean (2021-2025). Reproduce these numbers on the NPS IRMA Stats portal.

Reading it: March at Joshua Tree reads 0 (peak). July reads 67 (quietest). A 50 means about half the park's peak crowd.

Weather score

Formula: weatherScore = round(max(0, min(100, dayComfort − precipPenalty − snowPenalty − freezePenalty))). The piecewise day-comfort function is continuous at every boundary.

• Day comfort: tmax < 50°F → max(10, (tmax − 20) × 2) (cold tail); 50–60°F → 60 + (tmax − 50) × 4 (ramp to 100); 60–78°F → 100 (plateau); 78–85°F → 100 − (tmax − 78) × 5 (ramp to 65); > 85°F → max(30, 65 − (tmax − 85) × 5) (hot tail).
• Precip penalty: max(0, prcpIn − 1.5) × 8; kicks in above 1.5 in / month.
• Snow penalty: snowIn × 2.5. If the selected station does not publish a snowfall normal, the score applies no snow penalty and labels snowfall as unavailable.
• Night-freeze penalty: max(0, 32 − tmin) × 1.5 when tmin < 32°F.

Source: NOAA NCEI U.S. Climate Normals 1991-2020, station Twentynine Palms, CA (USC00049099, 1,975 ft).

Caveat: The Twentynine Palms cooperative observer station sits at 1,975 ft in the town of Twentynine Palms, outside the park. Most of the park is higher: NPS lists campground elevations from 3,000 ft at Cottonwood to 4,500 ft at Sheep Pass, and the park reaches 5,814 ft. Expect cooler days and colder nights up there than these station normals show. NPS says winter nights freeze and it occasionally snows at higher elevations. The station publishes no snowfall normal, so snowfall is shown as not reported.

Access score

Formula: For each named park road, count it open if its typical operating window covers that month. Score = round((sum of weights of open roads / sum of all weights) x 100). Where a park has a partial winter access mode, the profile documents that assumption in its access notes.

Route weights at Joshua Tree:

• Park Boulevard: the year-round scenic loop: Year-round access
• Pinto Basin Road: the south-corridor dark-sky drive: Year-round access; dark-sky corridor
• Black Rock and Indian Cove: separate entrances: Year-round road access
• Entry, fees, and passes: Year-round entry
• No water in the park (carry your own): Year-round
• Heat safety: summer hiking: Summer
• Campgrounds: reservations and first-come: Year-round (Belle and White Tank close June 1 to August 28)

Editorial methodology: the route weights are chosen by our editors from NPS road and lodge operating dates and the park's own access caveats below the score table.

Caveat: The score reflects wheeled-vehicle road access only. Backcountry, hiking, lodging, shuttle, and other service availability are not directly included unless the park profile states otherwise.

Why no combined score?

A combined "best month" number forces a weighting: how much do you care about crowds vs. weather vs. access? Those weights are personal. A photographer optimizing for golden light weights differently than a parent locked to school break weights differently than a winter visitor with a 4WD. We show the inputs and let you decide. Use the per-month grid above to navigate to a deeper page.