What Growing Zone Is Hamilton?

Our records indicate the United States Department of Agriculture has given Hamilton a growing zone designation of 5b. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Hamilton's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Hamilton's weather data from 1991 - 2020 in their analysis.

Latest MT growing zone map

If you are looking for plants suitable for growing in the Hamilton area, head on over to our page on plants that grow well in Hamilton, MT.

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Latest MT growing zone map

The growing zone is a measure of the lowest temperature that a plant can survive based on average lowest year temperatures, helping you to decide what plants would grow best in your particular climate. Since Hamilton is in growing zone 5b this means that plants there can survive temperatures as low as -15 to -10 degrees Fahrenheit. Plants for Hamilton's climate should be chosen with this in mind, or plants should be moved inside to keep their core temperature in the right range if necessary.

Some zones may have been changed by the USDA as of 2023. To see if the Hamilton area has been affected, refer to this map of half zone changes from the 2012 version of the USDA zones to the 2023 version.

The updated map shows that over half of the Southeast has warmed by about half a zone. For gardeners, that means you can now grow plants that tolerate a bit more heat and less frost than before. The tan areas reflect this shift. Meanwhile, the white areas had slight temperature changes, but not enough to move them into a new zone. In the Western U.S., a few spots shifted cooler. That’s not due to a colder climate, but because the new map uses a larger dataset, giving a more accurate picture of local conditions. It's important to keep track of these changes when planning your garden!

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Hardiness Zone FAQ

Have questions about hardiness zones and what they mean for your garden? Check out our FAQ below for quick answers to common questions about USDA hardiness zones and how they affect plant selection in Hamilton, MT.

The USDA hardiness zone is 5b for Hamilton. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.

Hamilton's Growing Zone Details

USDA Growing Zone: 5b

Zip Codes:

59840

Longitude: -114.1598

Latitude: 46.2527

Lowest Avg Temperatures (F): -15 to -10

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Map of the Hamilton Area

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Absarokee Acton Alberton Alder Alzada Amsterdam Anaconda Antelope Argenta Arlee Ashland Augusta Avon Ayers Ranch Colony Azure Babb Bainville Baker Ballantine Basin Batavia Bear Dance Bearcreek Beaver Creek Belfry Belgrade Belknap Belt Biddle Big Arm Big Sandy Big Sky Big Sky Colony Big Stone Colony Big Timber Bigfork Billings Birch Creek Colony Birney Black Eagle Blackfoot Bloomfield Boneau Bonner-West Riverside Boulder Box Elder Boyd Bozeman Brady Brandon Bridger Broadus Broadview Brockton Brockway Brooks Browning Bull Lake Busby Butte Bynum Camas Camp Three Camrose Colony Canyon Creek Cardwell Carlton Carter Cascade Cascade Colony Centerville Charlo Charlos Heights Chester Chinook Choteau Churchill Circle Clancy Clinton Clyde Park Coffee Creek Colstrip Columbia Falls Columbus Condon Conner Conrad Cooke City Coram Corvallis Corwin Springs Craig Crane Crow Agency Culbertson Custer Cut Bank Cyr Danvers Darby Dayton De Borgia Deer Lodge Deerfield Colony Dell Denton Dewey Dillon Dixon 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Montana City Montaqua Moore Mountain View Colony Muddy Musselshell Nashua Neihart New Miami Colony New Rockport Colony Niarada Nibbe Norris North Browning North Harlem Colony Noxon Nye Old Agency Olney Opheim Orchard Homes Outlook Ovando Pablo Paradise Park City Parker School Peerless Pendroy Philipsburg Piltzville Pine Creek Pinesdale Pinnacle Pioneer Junction Plains Pleasant Valley Colony Plentywood Plevna Polebridge Polson Pompeys Pillar Pondera Colony Ponderosa Pines Pony Poplar Potomac Power Prairie Elk Colony Pray Pryor Racetrack Rader Creek Radersburg Rapelje Ravalli Raynesford Red Lodge Redstone Reed Point Reserve Rexford Rhodes Riceville Richey Rimini Rimrock Colony Riverbend Riverview Colony Roberts Rockport Colony Rockvale Rocky Boy West Rocky Boy's Agency Rocky Point Rollins Ronan Roscoe Rosebud Roundup Roy Rudyard Ryegate Saco Saddle Butte Sage Creek Colony Saint Mary Saltese Sand Coulee Sangrey Santa Rita Sapphire Ridge Savage Scobey Sedan Seeley Lake Seville Colony Shawmut Shelby Shepherd Sheridan Sidney Silesia Silver Gate Silver Star Simms Sleeping Buffalo Snowslip Somers South Browning South Glastonbury South Hills Spokane Creek Spring Creek Colony Springdale Springdale Colony Springhill Springwater Colony Square Butte St. Ignatius St. Marie St. Pierre St. Regis St. Xavier Stanford Starr School Stevensville Stockett Stryker Sula Sun Prairie Sun River Sunburst Sunnybrook Colony Superior Surprise Creek Colony Swan Lake Sweet Grass Sylvanite Terry The Silos Thompson Falls Three Forks Toston Townsend Tracy Trego Trout Creek Troy Turah Turner Turner Colony Turtle Lake Twin Bridges Twin Creeks Twin Hills Colony Twodot Ulm Unionville Utica Valier Vaughn Victor Vida Virginia City Walkerville Warm Spring Creek Weeksville West Glacier West Glendive West Havre West Kootenai West Yellowstone Westby Wheatland White Haven White Sulphur Springs Whitefish Whitehall Whitetail Whitewater Whitlash Wibaux Willow Creek Wilsall Windham Wineglass Winifred Winnett Winston Wisdom Wise River Wolf Creek Wolf Point Woods Bay Worden Wye Wyola Yaak York Zenith Colony Zortman Zurich

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Plants For Other States

Looking for the best plants in a different area of the United States? Click on a button below to find plants that are ideal for that state's temperatures.

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