Frost dates in Salt Lake City, Utah

NOAA 1991–2020 normals for a 32 °F freeze. Low spots and the edge of town run colder than downtown.

Short answer

The average last spring frost in Salt Lake City is April 8, and the average first fall frost is October 31, from NOAA's Salt Lake City Intl Airport station, 2 miles from the middle of Salt Lake City. 1 year in 10 the last frost comes after April 30, and the first one by October 17. That leaves about 206 frost-free days. Salt Lake City is in USDA planting zone 7b.

Weather stations around Salt Lake City

The first row is the date most people in Salt Lake City go by. The others show how far the dates move across the area.

Station	Last spring frost	First fall frost	Frost-free
Salt Lake City Intl Airport 2 mi away, 4,225 ft	April 8 1 in 10 after April 30	October 31 1 in 10 by October 17	206 days
Salt Lake Triad Ctr 2 mi away, 4,280 ft	March 31 1 in 10 after April 19	November 8 1 in 10 by October 23	222 days
Bountiful-Val Verda 6 mi away, 4,540 ft	April 24 1 in 10 after May 14	October 19 1 in 10 by October 5	178 days
City Creek Wtp 6 mi away, 5,340 ft	May 13 1 in 10 after May 31	October 7 1 in 10 by September 26	147 days
Salt Lake City E Bench 7 mi away, 4,850 ft	April 25 1 in 10 after May 10	October 18 1 in 10 by October 5	176 days

Distances are from the middle of Salt Lake City as the Census Bureau maps it. The average date is NOAA's 50% date: half of years have a later last frost, or an earlier first one. Plan by the 1-in-10 date if a freeze would cost you plants. The planting zone is the USDA 2023 zone for ZIP code 84180, at the middle of the city.

Your exact ZIP code

Salt Lake City covers a lot of ground. For the station nearest your own street, and its planting zone, type your ZIP code.

How these dates work

Frost dates come from NOAA's 1991 to 2020 Climate Normals, which work out from each weather station's daily lows how likely the last spring freeze and the first fall freeze (32 °F) are by each date. We use the station nearest the middle of your ZIP code and show its height and distance, since a station on a hill or by a lake can differ from your yard.

The average date is the 50% date: half of years have a freeze after the spring date or before the fall one. The 1-in-10 dates are NOAA's 10% dates, the ones to plan by if a late freeze would cost you plants. Within one yard, cold air pools in low spots while walls and paving hold heat, so some corners freeze before others.

More frost dates

All of Utah, station by station.

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