Frost dates by ZIP code: The nearest NOAA stations to your ZIP, 1991-2020 normals
Enter a five-digit ZIP code. PlainClimate finds its center (Census Bureau 2024) and the five nearest NOAA stations with frost dates, and shows each station's last spring and first autumn 32°F dates with its distance and elevation.
Frost dates near ZIP 84601
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 84601 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Provo, UT, is 3 miles from the ZIP's center: its last spring frost comes after April 18 in half of years and after May 5 in one year in ten. By the USDA's method its plant hardiness zone is 7b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Provo, UTProvo BYU | 3 mi | 4,570 ft | April 18 | May 5 | October 21 | 7b |
| Orem, UTOrem Trtmt Plant | 4 mi | 4,510 ft | April 19 | May 9 | October 19 | 7a |
| Pleasant Grove, UT | 10 mi | 4,692 ft | April 17 | May 7 | October 25 | 7b |
| Spanish Fork Power House, UT | 11 mi | 4,720 ft | April 25 | May 13 | October 18 | 7a |
| Sundance, UT | 13 mi | 6,620 ft | May 17 | June 8 | October 5 | – |
Frost comes later in spring at higher and colder stations and earlier in low, open ground: prefer a station at a similar elevation to yours. Hardiness zone in the table: the USDA's rule (the average of each year's coldest night, 1991-2020) applied to the station's own record.
Every frost threshold at Provo
NOAA publishes the dates for several temperatures and odds. A 30% spring date means a 3-in-10 chance of a later frost (the convention almanacs use); 50% is the median; 10% the cautious date.
| Threshold | Spring, 10% | Spring, 30% | Spring, 50% | Spring, 90% | Autumn, 50% | Autumn, 10% |
|---|---|---|---|---|---|---|
| 36°F (light frost) | May 21 | May 10 | May 3 | April 19 | October 10 | September 28 |
| 32°F | May 5 | April 25 | April 18 | March 31 | October 21 | October 7 |
| 28°F (hard freeze) | April 17 | April 7 | March 31 | March 8 | November 1 | October 19 |
| 24°F | March 31 | March 16 | March 8 | February 19 | November 14 | October 30 |
Source: NOAA NCEI 1991-2020 annual normals; ZIP centers: Census Bureau 2024 Gazetteer; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. Autumn 10%: one year in ten has its first frost before this date.