Grass Valley, CA: Climate Zone, Risk and Window Requirements
Local risk and climate data for Grass Valley, CA are below, translated into plain terms for a window buyer rather than left as raw codes. Use it to check a proposed spec before you sign, not just to browse.
Licenses checked · California Contractors State License Board
5BIECC climate zone · ENERGY STAR Northern zone
Grass Valley's climate zone, in plain terms
Grass Valley falls in IECC climate zone 5B, and ENERGY STAR separately groups Nevada County into its Northern zone for window certification.
Those two numbers, not the brand on the box, set the U-factor and SHGC worth checking on any quote you get in Grass Valley.
A Truckee-Grass Valley, CA contractor who can't name either one on request is worth a second question before you sign.
Data: U.S. EPA / DOE, ENERGY STAR, ENERGY STAR Version 7.0 Climate Zones by County/ZIP (Windows, Doors, and Skylights) (V7.0); Pacific Northwest National Laboratory (DOE Building America), Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270) (2021 IECC), from the nearest NOAA station 1.4 mi away.
What FEMA's risk data says about Grass Valley
FEMA scores Nevada County's winter-weather risk as Relatively Moderate and its flood risk as Relatively Moderate.
Winter risk in Grass Valley weighs on U-factor and condensation resistance; flood risk weighs more on sill height and drainage detailing than on the glass package.
Treat these as two separate conversations with a Grass Valley contractor, not one.
- Strong wind
- Very Low
- Winter weather
- Relatively Moderate
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Grass Valley window bids come in
- How to Read an NFRC Window Label Four numbers on one sticker decide most of a window's real-world performance. Here's what each one means.
- ENERGY STAR Window Criteria by Climate Zone ENERGY STAR splits the country into four zones, each with its own numbers. Here they are, and why the Northern zone works backward from the other three.
- Impact Windows vs. Shutters in Florida's Hurricane Zones Florida gives homeowners two paths to a protected opening. Here's how each one is tested, and where the HVHZ raises the bar further.
Grass Valley's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Moule Glass And GlazingVerify license
- Grass Valley Glass INCVerify license
- Rak DevelopmentVerify license
- Pro Glass And Mirror INCVerify license
- Jada INCVerify license