Updated September 5, 2025
Quick answer:
Based on laboratory tests, the warmest Carhartt jackets right now are:
- Montana Loose Fit Insulated Jacket (107082) — best overall warmth-to-weight.
- FR Loose Fit Duck Insulated Active Jac (107076) — warmest FR option.
- Montana Loose Fit Washed Duck Active Jac (106975) — warm, classic fit
How they tested warmth
To determine the warmth rating of Carhartt jackets, each product is put on a high-tech mannequin covered in thermal sensors. This mannequin can simulate perspiration and is different according to which products are being tested: men’s, women’s, and even a child-sized model. Once equipped with the garments, it is enclosed in a temperature-controlled chamber for the tests that are repeated a minimum of three times. The tests were performed at the CMU Center for Merchandising and Design Technology. A numerical rating of “Clo” is given to each garment and sorted into four categories.
Carhartt doesn’t release these lab results to the public, but we were able to get a complete list for the purposes of this article and helping you find the right Carhartt jacket for your needs. You can read more about the testing process here.
FAQ’s
What’s the warmest Carhartt jacket?
Montana Loose Fit Insulated (107082) is the best warmth-to-weight performer right now. If you need FR, grab the FR Insulated Active Jac (107076). Carhartt calls its top category “Level 3 – Warmest” for severe cold. Carhartt+1
What does Level 4 mean?
It’s the brand’s highest standard warmth tier for severe cold.
Duck vs nylon shells — which is warmer?
Duck is durable but can leak more wind. Heavier insulated nylon shells or tech fabrics usually block wind better at the same weight. Consider Yukon Extremes for max toughness and wind block, Super Dux for lighter weight and water shedding.
Here are the warmest Carhartt jackets ranked from warmest to lightest
Warmth Rating Key: 4 Extreme Warmth, 3 Warmest, 2 Warmer, 1 Warm
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When it comes to wet weather, it's all about the right gear. This men's jacket offers insulated warmth to keep you working. Wind resistant and water repellent, it comes equipped with synthetic down insulation plus a sherpa fleece lining in the upper body to seal in heat. Pockets inside and out offer plenty of storage.
Check carhartt.comWarmth Rating: 4 Extreme WarmthI earn commissions on purchases, at no extra cost to you.
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This men's jacket continues the legacy with a mix of classic Carhartt heritage and technical outdoor performance. Soft-shell fabric with built-in flex is water repellent and wind resistant to keep you going in damp, blustery weather.
Check carhartt.comWarmth Rating: 4 Extreme WarmthI earn commissions on purchases, at no extra cost to you.
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It shrugs off light to moderate rain with a waterproof shell, and it has a soft brushed lining for warmth. This rugged layer features shoulder straps for your radio as well as a mix of zip pockets and flap pockets. The reflective silver trim is segmented for breathability.
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Made with nylon that's lightweight and strong, making it comfortable for active days. The reduced weight feels great while hiking, fishing, or just walking around. It also fights off wind, light rain, and cold, so you enjoy the outdoors to the fullest
Check carhartt.comWarmth Rating: 4 Extreme WarmthI earn commissions on purchases, at no extra cost to you.
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Carhartt Yukon Extremes gear is engineered for ultimate performance in the coldest conditions. This insulated active jac fights off cold, wind, and light rain so you can work through whatever weather comes your way.
Check carhartt.comWarmth Rating: 4 Extreme WarmthI earn commissions on purchases, at no extra cost to you.
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Made with an insulated Cordura® shell that fights off cold, wind, abrasion, and light rain. Includes reflective details, extra flex where you need it, and all the pockets you could ask for. Features Full Swing® Technology for stretch across the shoulders, arms that move free without the jacket riding up, and a bigger bend in the elbows.
Check carhartt.comWarmth Rating: 4 Extreme WarmthI earn commissions on purchases, at no extra cost to you.
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Made with heavyweight cotton canvas that fights off wind and cold while providing protection against flames. A quilted lining adds extra warmth and comfort.
Check carhartt.comWarmth Rating: 3 WarmestI earn commissions on purchases, at no extra cost to you.
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Rancher or lineman, anyone who works outside can appreciate the cold-weather chops of this men's hooded jacket. Proudly , it's crafted with rugged cotton duck, and the body and hood are lined with quilted flannel for under-the-covers warmth.
Check carhartt.comWarmth Rating: 3 WarmestI earn commissions on purchases, at no extra cost to you.
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Made from heavyweight cotton duck that's flame-resistant, wind-resistant, and warm. Extra details include shoulder straps for your radio and snaps under the collar to attach a hood.
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Made of heavyweight Carhartt cotton duck, which is sanded and brushed for softness. It's made for comfort, with internal rib-knit cuffs and a warm Sherpa lining. Previously known as the Sierra Jacket.
Check carhartt.comWarmth Rating: 3 WarmestI earn commissions on purchases, at no extra cost to you.
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An update to one of our most popular Active Jacs, the J130, this men's jacket was designed using feedback from the Carhartt Crew.
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Named after the original Carhartt hunting gear from the 1930s, but it features modern insulation and a lightweight, low-profile feel that flexes for an unrestricted feel. Back pleats and underarm gussets make sure you always have room to swing an axe or reach over your head. It's also wind-resistant, sheds light rain, and is more abrasion-resistant than traditional duck canvas. An adjustable hood and plenty of pockets make sure you're always prepared.
Check carhartt.comWarmth Rating: 3 WarmestI earn commissions on purchases, at no extra cost to you.
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Made with heavyweight firm-hand duck, which only gets better with time. Built for cold temperatures, this coat features a smooth quilted lining as well as the warmest insulation we offer. The two-way front zip brings some comfort to long hours behind the wheel.
Check carhartt.comWarmth Rating: 3 WarmestI earn commissions on purchases, at no extra cost to you.
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Made of stretch ripstop, it's quilt-lined for extra warmth and reinforced with CORDURA® Fabric at the cuff and hem for durability where you need it most. Previously known as the Full Swing® Steel Jacket.
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Made of lightweight yet durable duck that's water-repellent and flame-resistant. It's insulated for warmth and features stretch panels that allow you to move freely.
Check carhartt.comWarmth Rating: 3 WarmestI earn commissions on purchases, at no extra cost to you.
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Lightweight and built to move, its relaxed fit and built-in flex let you get on with the job when the weather tries to slow you down. Secure pockets inside and out keep small essentials within reach, and reflective details add low-light visibility.
Check carhartt.comWarmth Rating: 2 WarmerI earn commissions on purchases, at no extra cost to you.
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Rugged duck canvas has built-in flex that lets you move and reach without feeling restricted. Whether you're setting up camp or working around the farm, it handles the wear and tear of the outdoors with reinforced sleeves and triple-stitched main seams. Quilted insulation seals in heat, and water-repellent technology keeps you dry in light rain. A loose fit offers room to layer and a comfortable fit.
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Bringing technical outdoor features to our classic active jac. It blocks wind, shrugs off light rain, and has a soft sherpa lining for warmth. The nylon is lighter and stronger than traditional duck fabric, giving it the durability and comfort for days on the move.
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Made with durable cotton duck and is reinforced with Cordura® at wear points along the cuffs. This warm layer is lined with soft sherpa fleece through the body and hood, with warm quilted nylon through the sleeves. Previously known as the Washed Duck Bartlett Jacket.
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Weighing in at 1.75 ounces, the durable CORDURA® fabric shell is lighter than most tops. It's insulated and quilted for extra comfort, and it features a water-repellent coating that shrugs off light rain and snow. This versatile jacket can be worn with inner or outer layers when the temperature plummets, and it comes equipped with ample pockets. Previously known as the Gilliam Jacket
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This rugged layer is made with our Quick Duck canvas, which is lighter than traditional sandstone duck, but ounce-for-ounce just as tough. It also has a smooth quilted lining and plenty of pockets for your gear. Previously known as the Quick Duck Jefferson Jacket.
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Carhartt signature cotton duck fabric provides a tough exterior, while a soft sherpa-lining provides warmth and comfort through the winter months. Previously known as the Ridge Coat.
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Through the rise and fall of different trends, the Chore Coat remains a classic. From the pocket watch to the wristwatch to the phone, new technologies call for adaptations in design. But through it all its looks stay rooted in heritage. This men's heavyweight coat has a blanket-lined construction that's water-repellent, wind-resistant, and warm. The signature corduroy collar is the same as it was in the late 1930s, and the rugged firm-hand duck fabric only gets better with time
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The Active Jac has been a favorite on American ranches, farms, and factory floors since its release in the '70s. Built to move, this modern version is designed with stretch panels across the back and elbows. It's cut from warm fleece-lined duck that feels broken-in from the start. Previously known as the Full Swing® Armstrong Active Jac.
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Carhartt's version of the classic fleece slipover jacket. This men's warm layer works well Monday-Friday or for hikes on the weekends. It has a relaxed fit, so it layers easily. Adjust the drawcord at the hem to seal out the cold.
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Carhartt’s anorak keeps you moving through cool temps and light rain. It has a loose cut that makes it easy to layer over sweats. And once the clouds clear, you can pack it into its own pocket for easy storage.
Check carhartt.comWarmth Rating: 1 WarmI earn commissions on purchases, at no extra cost to you.
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Made of lightweight nylon with water-repellent Rain Defender®. Mesh lining adds breathability. Plenty of pockets inside and out keep tools and supplies at the ready.
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Soft-shell fabric with built-in flex is water repellent and wind resistant to keep you going in damp, blustery weather.
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The Detroit Jacket built a reputation for toughness on the backs of warehouse workers, farmhands, and ranchers across America. This men's jacket is made of cotton duck that's rugged and durable. It has a warm blanket lining down the body with smooth quilted nylon through the sleeves. The droptail hem provides extra coverage but leaves enough room for your tool belt.
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Made of lightweight, water-resistant fabric that gives you the warmth and durability of sandstone duck without the bulk. Stretch panels on the back, elbows, and sides let you maneuver into tight spots.
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Heavyweight softshell construction holds its own through wind, cold, and light precipitation. It features a large pocket on the inside as well as three zip pockets on the outside. Previously known as the Crowley Jacket.
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Made of grid-textured fleece bonded to a stretch-fabric shell for extra warmth. An adjustable hood provides extra protection from the weather. The midweight layer can be worn under or over another jacket. Previously known as the Hooded Rough Cut Jacket.
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This water-repellent and wind-resistant jacket is made of lightweight nylon with built-in flex so you can move freely. Plenty of pockets inside and out keep tools and supplies safely stowed.
Check carhartt.comWarmth Rating: 1 WarmI earn commissions on purchases, at no extra cost to you.
I recently purchased a Rain Defender jacket. The description says it’s wormth rating is 2. Can you tell me how that equates to temperature?
50-60 F