Window Climate Specs for Spokane, WA

Spokane sits in IECC climate zone 5B, which sets the energy-performance bar for any window installed here. Below that, a short list of Spokane's longest-licensed window contractors can turn a spec into an actual installed window.

Licenses checked September 30, 2026 · Washington State Department of Labor & Industries

5BIECC climate zone · ENERGY STAR Northern zone

What zone 5B means for a Spokane window

Spokane falls in IECC climate zone 5B, and ENERGY STAR separately groups Spokane 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 Spokane.

A Spokane-Spokane Valley, WA 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 5.3 mi away.

Storm and weather risk around Spokane

FEMA scores Spokane County's winter-weather risk as Relatively High and its flood risk as Relatively Moderate.

Winter risk in Spokane 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 Spokane contractor, not one.

Strong wind: Relatively High
Winter weather: Relatively High

Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).

Guides to finish before Spokane 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.

Window installers with the longest license records in Spokane

Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.

Marlin Windows INCWindow and glass contractor · licensed 24 years · 99212Verify license
City Glass Spokane INCWindow and glass contractor · licensed 20 years · 99217Verify license
Cowboy & Indian Windows/SDNGWindow and glass contractor · licensed 19 years · 99203Verify license
Specialty Windows CommercialWindow and glass contractor · licensed 17 years · 99202Verify license
Five Mile Glass LLCWindow and glass contractor · licensed 14 years · 99208Verify license
Window & Flooring Sltns LLCWindow and glass contractor · licensed 9 years · 99228Verify license
Northwest Window & DoorWindow and glass contractor · licensed 8 years · 99214Verify license
Window Genie Of SpokaneWindow and glass contractor · licensed 6 years · 99206Verify license
Torminos Glass INCWindow and glass contractor · licensed 6 years · 99208Verify license
Vpi Quality Windows INCWindow and glass contractor · licensed 3 years · 99202Verify license
Nty Windows LLCWindow and glass contractor · licensed under a year · 99201Verify license
Jewsbury Siding & WindowsWindow and glass contractor · licensed under a year · 99205Verify license

Compare climate data in other Washington cities

All cities in Washington →