What the app shows you
Full FogCast score, fog type, chase-or-skip verdict, and 10-day outlook — all in the app.
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Know before you drive: FogCast checks the conditions that produce photogenic fog
Get more than a snapshot of current conditions. The LightCast app unlocks everything to plan ahead
Humidity alone isn't enough. Wind alone isn't enough. Cloud cover alone isn't enough. Photogenic valley fog requires several conditions to line up at once, and most weather apps don't read them together.
Set a FogCast threshold once. The app will alert you when conditions at your saved locations look promising, so you're not manually checking at 4am.
Don't waste a sunrise drive. Check FogCast before you leave.
Download on the App StoreMonument Valley straddles the Arizona–Utah border on the Navajo Nation, a flat red sand plain scattered with massive sandstone buttes — the Mittens, Merrick Butte, and the Three Sisters — that rise 300 meters from the valley floor. This is one of the most photographed landscapes in North America, and fog transforms it entirely. When low fog or winter stratus forms in the valley and the buttes emerge above the cloud layer, the iconic formations take on a gravity-defying quality — each mesa appears to float independently above white, disconnected from the earth below.
The John Ford's Point overlook and the Valley Drive viewpoints offer the classic Mitten views when fog fills the valley. Fog in Monument Valley is relatively rare — the Colorado Plateau is a high-desert environment averaging fewer than 15 fog days per year — which means a significant fog event here is exceptional and worth significant effort. Winter, November through February, is the most likely season. Snow on the buttes combined with valley fog is among the most dramatic conditions possible in the American Southwest.
Monument Valley fog forms when winter weather systems bring moisture over the Colorado Plateau and temperatures drop sharply overnight into the single digits. The flat valley floor at 1,500 meters is susceptible to cold air pooling when winds calm after a frontal passage. If a winter storm system is followed by rapid clearing and cold temperatures, the overnight window for valley fog is significant. This is one location where monitoring conditions the night before is more important than any general forecast.