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 84604
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 84604 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Sundance, UT, is 5 miles from the ZIP's center: its last spring frost comes after May 17 in half of years and after June 8 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Sundance, UT | 5 mi | 6,620 ft | May 17 | June 8 | October 5 | – |
| Provo, UTProvo BYU | 6 mi | 4,570 ft | April 18 | May 5 | October 21 | 7b |
| Deer Creek Dam, UT | 6 mi | 5,270 ft | May 28 | June 15 | September 23 | 6a |
| Pleasant Grove, UT | 9 mi | 4,692 ft | April 17 | May 7 | October 25 | 7b |
| Orem, UTOrem Trtmt Plant | 9 mi | 4,510 ft | April 19 | May 9 | October 19 | 7a |
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 Sundance
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) | June 17 | June 7 | June 1 | May 16 | September 25 | September 11 |
| 32°F | June 8 | May 28 | May 17 | May 1 | October 5 | September 22 |
| 28°F (hard freeze) | May 25 | May 10 | May 2 | April 17 | October 17 | October 2 |
| 24°F | May 6 | April 27 | April 19 | March 29 | October 28 | October 14 |
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.