Yosemite is one of the most popular US National Parks with 4.15 million visitors in 2015 and for good reason. With Half Dome, El Cap, The PCT, John Muir Trail and 100s of other scenic hikes you can’t go wrong spending 2 days or 2 weeks in the park.
Cairn users have been accumulating cell coverage data in the park and mapping popular places. Here’s the quick scoop to help you plan your visit:
Tuolumne Meadows
AT&T: Voice and 3G (4G HSPA+) data service are available in parts of Yosemite Valley Voice and EDGE data service are available at Tuolumne Meadows.
Cairn tests resulted in poor coverage (AT&T and Sprint) in the TM campground, several calls were unsuccessful and no texts made it in or out. Reception at the TM store itself is decent for voice and text but data is lacking.
Verizon Wireless: Voice and 3G data service are available in parts of Yosemite Valley and El Portal. Voice and 1x data service are available in Tuolumne Meadows, Crane Flat, and Wawona.
Half Dome
Cell coverage is generally good at the top of Half Dome. Cairn needs more users mapping data on the rest of the trail before we can make an assessment elsewhere.
June Lake
Verizon coverage on the eastern side of the Sierra’s was ok and good at June Lake.
Yosemite Valley
All 4 major carriers had coverage. Verizon and AT&T were best, but with Sprint and T-mobile one could communicate by going to the right spots. AT&T had coverage at the North end of the Valley on and around Northside Drive. It’s possible to get Verizon coverage at quite a few spots in the Valley including Northside and Southside drive. Sprint, Verizon, T-mobile, and AT&T had coverage at Yosemite Village.
Cairn users have mapped the entire John Muir Trail for AT&T and Verizon. Download Cairn to see exact spots.
