Frost King
4 verified products
Browse on Amazon →Last verified: April 2026
Read our full verification: Is Frost King Made in USA?Verification Summary
American Score
Manufacturing Location
Elizabeth, NJ
Headquarters
Elizabeth, NJ
Founded
1920
Products Verified
4 products
Evidence Breakdown
Factory Location Specificity
Specific factory city identified
Website Claim
Brand website explicitly claims Made in USA
Manufacturing History
20+ years of USA manufacturing
Known Overseas Production
No known overseas production
Verification Notes
Frost King is the brand of Thermwell Products Co. in Elizabeth, New Jersey. Nation's #1 and most trusted brand of packaged weatherstripping with 2,000+ products made in New Jersey since 1955.
Last verified: April 2026
Frost King has been manufacturing products in Elizabeth, NJ since 1920. We carry 4 verified American-made Frost King products.
A Century of Home Weatherproofing
Frost King is a brand of Thermwell Products, which has manufactured home weatherization products in Mahwah, New Jersey since 1920. For over a century, Frost King has supplied American homeowners with the weatherstripping, door sweeps, pipe insulation, and window film that prevent energy waste and protect against cold drafts.
Mahwah, in Bergen County, New Jersey, has been Thermwell's manufacturing home through the entire history of modern American home construction. The company's products have been part of American home maintenance through the post-war housing boom, the energy crisis of the 1970s, and today's focus on energy efficiency.
Made in New Jersey
Frost King's weatherstripping and insulation products are made at the Mahwah facility using foam, rubber, and vinyl materials designed for the specific temperature ranges and moisture conditions of American climates. The foam rubber door and window weatherstripping is die-cut and packaged in New Jersey; the pipe insulation is extruded and cut domestically.
For homeowners doing their own energy improvements, Frost King represents the most accessible entry point — products available at every hardware store in America, made domestically by a company that has been solving American home weatherization problems for over 100 years.
Quick Picks
Frequently Asked Questions
Is Frost King made in the USA?
Yes. Frost King manufactures 4 verified products in Elizabeth, NJ. Frost King has been manufacturing weatherstripping, insulation, and home energy-saving products in Mahwah, New Jersey since 1920, providing American homeowners with the sealing and insulation products that keep homes comfortable and energy-efficient.
Where is Frost King manufactured?
Frost King is headquartered in Elizabeth, NJ. Manufacturing takes place in Elizabeth, NJ.
What Frost King products can I buy?
We carry 4 verified Frost King products across Tools & Hardware. Every listing links directly to Amazon with verified American manufacturing.
When was Frost King founded?
Frost King was founded in 1920. Frost King has been manufacturing weatherstripping, insulation, and home energy-saving products in Mahwah, New Jersey since 1920, providing American homeowners with the sealing and insulation products that keep homes comfortable and energy-efficient.
Does Frost King ship from Amazon?
Yes, all Frost King products listed here are available on Amazon with free shipping for Prime members.