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 84070
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 84070 in zone 7b (the coldest night of a typical year: 5 to 10°F).
The nearest station, Draper, UT, is 6 miles from the ZIP's center: its last spring frost comes after April 18 in half of years and after May 6 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Draper, UTDraper-Point Of Mountain | 6 mi | 4,506 ft | April 18 | May 6 | October 22 | – |
| Cottonwood Heights, UTCottonwood Weir | 6 mi | 4,986 ft | April 29 | May 30 | October 22 | 7a |
| Alpine, UT | 10 mi | 5,100 ft | May 3 | May 26 | October 12 | 7a |
| Salt Lake City E Bench, UT | 12 mi | 4,850 ft | April 25 | May 10 | October 18 | – |
| Timpanogos Cave, UT | 13 mi | 5,740 ft | May 2 | May 26 | October 16 | – |
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 Draper
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 22 | May 9 | May 2 | April 17 | October 10 | September 27 |
| 32°F | May 6 | April 25 | April 18 | March 31 | October 22 | October 7 |
| 28°F (hard freeze) | April 17 | April 7 | March 31 | March 7 | November 2 | October 18 |
| 24°F | April 2 | March 19 | March 8 | February 19 | November 13 | October 26 |
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.