Frost dates for Salt Lake City, Utah
Utah · first & last freeze, from NOAA 1991–2020 climate normals
In a typical year, the last spring freeze around Salt Lake City comes near April 8 and the first fall freeze near October 31. One year in ten, a freeze still arrives after April 30 in spring — and one year in ten, the first fall freeze has already landed by October 17. NCEI's own growing-season statistic (days between freezes, percentiled per year) puts the median at 204 days.
Freeze-date probabilities, three thresholds
| Threshold | Last spring — 9 in 10 years past by | Last spring — typical (median) | Last spring — 1 in 10 years later than | First fall — 1 in 10 years by | First fall — typical (median) | First fall — 9 in 10 years by |
|---|---|---|---|---|---|---|
| 36°F — near-freezing (frost can occur) | April 8 | April 27 | May 14 | October 7 | October 19 | November 2 |
| 32°F — freezing | March 17 | April 8 | April 30 | October 17 | October 31 | November 13 |
| 28°F — hard freeze | February 27 | March 15 | April 8 | October 27 | November 10 | November 24 |
Measured at Salt Lake City Intl Ap, UT (USW00024127), 2.0 mi from the city's census reference point, elev. 4,225 ft. NOAA/NCEI 1991–2020 normals. Read each date column as odds over the 30-year record — e.g. "9 in 10 years past by" means only one spring in ten saw a later freeze than that date.
Frost-free windows (computed)
| Window (32°F ends) | Opens | Closes | Length |
|---|---|---|---|
| Cautious (1-in-10 freeze risk at each end) | April 30 | October 17 | 170 days |
| Typical (median freeze dates) | April 8 | October 31 | 206 days |
| Gambler's (9-in-10 freeze risk at each end) | March 17 | November 13 | 241 days |
Pure arithmetic on the freeze-date percentiles above — the "cautious" window opens on the date only 1 year in 10 still sees a later spring freeze, and closes on the date by which only 1 year in 10 has already frozen.
About this city's numbers
- Census entity: Salt Lake City city, Utah — official 2024 population estimate 217,783.
- Weather station: Salt Lake City Intl Ap, UT (USW00024127), 2.0 mi from the city's census-gazetteer reference point at elevation 4,225 ft. Frost dates are that station's history — neighborhoods vary.
- Data pulled 2026-09-05; normals period 1991-2020 (replaced by NOAA roughly once a decade).
More Utah cities
West Valley City · West Jordan · Provo · St. George · Orem · Lehi · Sandy · all of Utah →