Frost dates for Salt Lake City
The typical last spring frost in Salt Lake City is Apr 8, and the typical first fall frost is Oct 31. These dates come from Salt Lake City International Airport, and the growing season between them is 204 days.
NCEI U.S. Climate Normals 1991-2020, annual/seasonal (c20230404), USW00024127
This season's measured frost
No freeze has been recorded yet this fall at Salt Lake City International Airport; the lowest reading since July 1 is 51F on Sep 20, against a typical first frost date of Oct 31.
In 2026, the last spring freeze at Salt Lake City International Airport was on Apr 18 with a low of 32F, 10 days later than the typical date of Apr 8.
Readings come from official daily lows in the daily climate report of the National Weather Service, via the Iowa Environmental Mesonet.
Early, typical and late years for Salt Lake City
| Year type | Last spring frost | First fall frost |
|---|---|---|
| Early year (1 in 10) | Mar 17 | Oct 17 |
| Typical year | Apr 8 | Oct 31 |
| Late year (1 in 10) | Apr 30 | Nov 13 |
For spring, an early year means 1 year in 10 has a last freeze before the early date, and a late year means 1 year in 10 has a last freeze after the late date. For fall, an early year means 1 year in 10 has a first freeze by the early date, and a late year means it holds off past the late date.
The growing season in a typical year is 204 days, with the shortest at 177 days and the longest at 229 days in 1 year in 10.
Frost and freeze thresholds
| Last spring frost | First fall frost | |
|---|---|---|
| Light frost (36F) | Apr 27 | Oct 19 |
| Freeze (32F) | Apr 8 | Oct 31 |
| Hard freeze (28F) | Mar 15 | Nov 10 |
Clear, calm nights can see frost on plants at a low of 36F. A low of 32F is a freeze, and most tender plants are killed at 28F, a hard freeze.
More weather for Salt Lake City
A typical date is the median: half of years have an earlier last spring frost, half a later one. An early year means 1 year in 10, and a late year means 1 year in 10. Dates come from the U.S. Climate Normals for 1991-2020, published by NOAA's National Centers for Environmental Information, using a daily low of 32F or below as a freeze.
The daily climate report is issued by the local National Weather Service forecast office and delivered to this page by the Iowa Environmental Mesonet of Iowa State University. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.