St. Paul, MN: Climate Zone, Risk and Window Requirements

ENERGY STAR groups Ramsey County into its Northern zone, which is the U-factor and SHGC target worth checking against any quote you get in St. Paul. The longest-licensed window contractors based in St. Paul are listed below the climate data.

Licenses checked September 30, 2026 · Minnesota Department of Labor and Industry

6AIECC climate zone · ENERGY STAR Northern zone

What zone 6A means for a St. Paul window

Minneapolis-St. Paul-Bloomington, MN-WI runs a January average near 16°F and climbs to about 73°F by July, a swing that adds up to roughly 7,443 heating degree days most winters, with 724 on the summer cooling side of the ledger.

That load is the actual argument for paying up for a better U-factor in St. Paul, separate from anything a brochure claims.

Zone 6A's requirement is the floor; St. Paul's specific load is what tells you whether beating that floor is worth the extra cost.

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 2.6 mi away.

Storm and weather risk around St. Paul

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

Winter risk in St. Paul 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 St. Paul 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 St. Paul 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 St. Paul

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

Gladstones Window And Door StoreWindow and glass contractor · licensed 34 years · 55109Verify license
Restoration Window Systems LLCWindow and glass contractor · licensed 30 years · 55105Verify license
Window Concepts Of Minnesota INCWindow and glass contractor · licensed 27 years · 55107Verify license
Window World Twin CitiesWindow and glass contractor · licensed 23 years · 55109Verify license
Borden Window LLCWindow and glass contractor · licensed 21 years · 55106Verify license
Basement Window GuyWindow and glass contractor · licensed 5 years · 55117Verify license

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