If you’ve spent any time in Colorado, you know the weather here doesn’t follow the script. It can be sunny and 70 at lunch, then dumping snow by dinnertime. I’ve experienced the wild Chinook windstorms in Boulder that knocked out power — it reminded me again why window durability really matters.

Whether you’re in Denver, Boulder, Fort Collins, or Colorado Springs, your windows have to stand up to some of the most unpredictable conditions anywhere in the country — and still look good doing it.

At 1stWindows.com, we know Colorado well. You know the saying.  If you don’t like the weather in Colorado then wait 30 minutes.   1stWindows is founded by a CU Alum (Go Buffs!) and has lived and built homes across the state.

We’ve been helping Colorado homeowners and builders purchase the right Milgard windows for years — and we know what works here and what doesn’t. Actually, I should probably add something about how our products hold up in the dry summers too — totally spaced on that.

Built for Colorado Conditions

Not all windows are cut out for the Colorado lifestyle. Between the altitude, the dry air, the snow loads, and the sharp temperature swings, this isn’t the place to cut corners.

Here’s what makes Milgard a smart pick for Colorado homes:

• - Energy-efficient glass that helps control heating and cooling costs year-round
• - High-altitude glass options to prevent seal failure in mountain areas
• - Durable frames in vinyl, fiberglass, or thermally improved aluminum that resist warping, cracking, and weather damage

Whether you're up in Breckenridge, out on the plains near Greeley, or tucked into the hills outside Castle Rock, Milgard has a solution that fits. I remember installing a Trinsic™ window in a mountain home near Nederland and we had to pause the job halfway through because of a surprise snow squall — in May.

Which Milgard Series Is Right for You?

Here’s the lineup most Colorado customers end up choosing from:

Tuscany® Series – A go-to for Colorado homes: traditional styling, great insulation, and a solid price

Trinsic™ Series – A modern option with minimal frame and maximum glass — great for clean, contemporary designs

Style Line® Series – Streamlined and affordable, perfect for investment properties or budget-conscious upgrades

Ultra™ Series – Built with fiberglass to take on extreme conditions — these windows are made to last

Thermally Improved Aluminum – Sleek and strong, ideal for modern architecture with a bit more thermal protection

Every Milgard window is made to order and backed by their Full Lifetime Warranty, covering both parts and labor. Oh — and if you're up high like in Leadville, make sure to mention that altitude when ordering. I almost forgot that once — won’t do that again.

Why Colorado Homeowners Trust 1stWindows

We’re not just another online store — we’ve been working directly with Colorado customers for years. We know the codes, the rebates, and the elevation requirements. Whether you’re replacing windows in a ranch house in Aurora, remodeling a mid-century home in Lakewood, or building a vacation property in Estes Park, we can help.

• - No-pressure, factory-direct pricing
• - Custom quotes based on your actual window sizes
• - Friendly, expert guidance from people who understand local conditions
• - Shipping statewide — yes, even to hard-to-reach mountain towns

Get Your Free Quote

Already have your window sizes? You can build a quote online in minutes. Not sure how to measure? No problem — our How to Measure guide will walk you through it step-by-step.

We ship Milgard windows all across Colorado — from Pueblo to Loveland, and just about everywhere in between. Actually, if you're in Telluride and wondering if we reach that far — yes, we do.

Questions? Email us anytime at [email protected]. We’re happy to help.