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 04489
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 04489 in zone 5a (the coldest night of a typical year: -20 to -15°F).
The nearest station, Orono, ME, is 1 miles from the ZIP's center: its last spring frost comes after May 1 in half of years and after May 14 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Orono, ME | 1 mi | 115 ft | May 1 | May 14 | October 6 | – |
| Old, MEOld Town (2 mi W) | 1 mi | 127 ft | May 13 | May 28 | September 28 | 5a |
| Bangor, MEBangor International Airport | 10 mi | 148 ft | May 4 | May 17 | October 4 | 5a |
| Corinna, ME | 27 mi | 297 ft | May 8 | May 23 | October 3 | 4b |
| Dover-Foxcroft, MEDover-Foxcroft Wastewater Treatment Plant | 31 mi | 370 ft | May 15 | May 28 | September 28 | 5a |
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 Orono
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 31 | May 20 | May 14 | May 2 | September 28 | September 13 |
| 32°F | May 14 | May 6 | May 1 | April 22 | October 6 | September 24 |
| 28°F (hard freeze) | May 1 | April 25 | April 20 | April 9 | October 20 | October 3 |
| 24°F | April 21 | April 15 | April 9 | March 31 | November 4 | October 19 |
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.