About NoGo Sierra
NoGo Sierra is a real-time outdoor condition forecasting tool built for the Sierra Nevada. It pulls together weather, crowding, fire, avalanche, air quality, and trail data into a single score for every trailhead, lake, resort, campground, and peak across the range — so you can pick the right place at the right time, not just the most popular one.
Why we built it
The Sierra Nevada draws millions of visitors every year, but the information most people use to plan trips — Instagram posts, generic weather apps, and word of mouth — is scattered, out of date, or completely missing for the majority of the range.
Popular destinations end up overcrowded while equally beautiful locations an hour away sit empty. NoGo Sierra is designed to change that by making real-time condition data accessible for the whole range, not just the top 20 spots.
Data sources
Coverage
The map currently covers 3,188 locations across six corridors: North Sierra, Tahoe, Yosemite, Mammoth, Eastern Sierra, and Kings / Sequoia. Scores are refreshed multiple times per day using a cloud pipeline that runs automated ingestion and processing across all locations simultaneously.