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 80634
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 80634 in zone 5b (the coldest night of a typical year: -15 to -10°F).
The nearest station, Greeley, CO, is 5 miles from the ZIP's center: its last spring frost comes after May 2 in half of years and after May 14 in one year in ten. By the USDA's method its plant hardiness zone is 6a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Greeley, COGreeley Unc | 5 mi | 4,715 ft | May 2 | May 14 | October 8 | 6a |
| Loveland, CO2 mi N | 16 mi | 5,080 ft | May 10 | May 22 | October 1 | 5b |
| Fort Collins (4 mi E), CO | 17 mi | 4,920 ft | May 3 | May 15 | October 6 | – |
| Fort Collins, CO | 20 mi | 5,004 ft | May 2 | May 14 | October 7 | 6a |
| Longmont, CO2 mi ESE | 22 mi | 4,950 ft | May 7 | May 22 | 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 Greeley
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 26 | May 17 | May 12 | May 1 | September 30 | September 18 |
| 32°F | May 14 | May 7 | May 2 | April 17 | October 8 | September 26 |
| 28°F (hard freeze) | May 5 | April 27 | April 20 | April 5 | October 18 | October 4 |
| 24°F | April 24 | April 14 | April 6 | March 19 | October 28 | October 13 |
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.