Utah frost dates

Average last spring and first fall frost dates for Utah’s largest cities, with each city’s USDA hardiness zone.

Reviewed October 2026

Among Utah’s 20 largest cities, the average last spring frost ranges from Mar 14 in St. George to Jun 2 in Eagle Mountain. Elevation, distance from the coast and city heat all shift the date, so use your own ZIP code below for the closest match.

City	Average last spring frost	Average first fall frost	Frost-free days	Hardiness zone	Weather station used
Salt Lake City	Mar 31	Nov 8	222	6b–7b	Salt Lake Triad Ctr, UT, 2 mi
West Valley City	Apr 8	Oct 31	206	7b	Salt Lake City Intl Airport, UT, 7 mi
West Jordan	Apr 18	Oct 22	187	7a–7b	Draper-Point Of Mtn, UT, 10 mi
Provo	Apr 18	Oct 21	186	7a	Provo Byu, UT
St. George	Mar 14	Nov 10	241	8b	St George, UT, 3 mi
Orem	Apr 19	Oct 19	183	7a	Orem Trtmt Plt, UT, 2 mi
Lehi	Apr 30	Oct 9	162	7a	Utah Lake Lehi, UT, 4 mi
Sandy	Apr 29	Oct 22	176	7a–7b	Cottonwood Weir, UT, 5 mi
Ogden	Apr 21	Oct 23	185	6b–7a	Ogden Pioneer Ph, UT, 2 mi
South Jordan	Apr 18	Oct 22	187	7a–7b	Draper-Point Of Mtn, UT, 7 mi
Layton	Apr 29	Oct 20	174	7a–7b	Weber Basin Pump Plt 3, UT, 3 mi
Millcreek	Apr 25	Oct 18	176	7a–7b	Salt Lake City E Bench, UT, 3 mi
Herriman	Apr 18	Oct 22	187	7a	Draper-Point Of Mtn, UT, 6 mi
Eagle Mountain	Jun 2	Sep 16	106	6a–7a	Fairfield, UT, 5 mi
Taylorsville	Mar 31	Nov 8	222	7b	Salt Lake Triad Ctr, UT, 8 mi
Saratoga Springs	Apr 30	Oct 9	162	6b–7a	Utah Lake Lehi, UT
Logan	May 8	Oct 2	147	6a	Logan Radio Kvnu, UT
Murray	Apr 29	Oct 22	176	7b	Cottonwood Weir, UT, 6 mi
Draper	Apr 18	Oct 22	187	7a–7b	Draper-Point Of Mtn, UT, 2 mi
Spanish Fork	Apr 25	Oct 18	176	7a	Spanish Fk Pwr House, UT, 3 mi

Frost dates are the dates after (spring) or before (fall) which the chance of a 32°F freeze is below 50%, from NOAA’s 1991–2020 U.S. Climate Normals for the weather station nearest each city’s center. Zones are from the 2023 USDA Plant Hardiness Zone Map for the ZIP codes around each city; a range means nearby ZIP codes differ. Cities are the 20 largest by Census Bureau 2024 population estimates.

An average is not a guarantee. There’s still about a 1 in 2 chance of frost after the average last spring date. Many gardeners wait an extra week or two before setting out tomatoes, peppers and basil, and keep covers handy.

Planting dates for Salt Lake City

Timed from Salt Lake City’s average last frost of Mar 31, using University of New Hampshire Extension’s planting guidance. For your exact dates, enter your ZIP code in the calendar below.

Crop	Start seeds indoors	Plant outside
Tomatoes	Feb 10 to Feb 24	Apr 7 to Apr 14
Peppers	Feb 3 to Feb 17	Apr 14
Lettuce	Jan 27 to Feb 3	Mar 3 to Mar 10
Broccoli	Jan 20 to Feb 3	Mar 3 to Mar 17
Cucumbers	Mar 10 to Mar 17	Apr 7 to Apr 14
Basil	Feb 17 to Mar 3	Apr 14

When to plant, for your garden

Your seed-starting and planting dates, timed from your last spring frost. Full calendar, 12 crops.

ZIP code

Last frost date

Enter your ZIP code to look up your average last frost date and hardiness zone, or type the date in yourself.

Frost dates: NOAA U.S. Climate Normals, 1991–2020. Hardiness zones: USDA Plant Hardiness Zone Map, 2023, ZIP code data from PRISM Group, Oregon State University, prism.oregonstate.edu, accessed Oct. 20, 2026.

More about frost dates

How to find your last frost date, and what your zone means · Full planting calendar · How to start seeds indoors

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