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 03063
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 03063 in zone 6a (the coldest night of a typical year: -10 to -5°F).
The nearest station, Nashua (2 mi NNW), NH, is 2 miles from the ZIP's center: its last spring frost comes after April 30 in half of years and after May 11 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 |
|---|---|---|---|---|---|---|
| Nashua (2 mi NNW), NH | 2 mi | 135 ft | April 30 | May 11 | October 12 | 6a |
| Nashua, NHNashua Cwsu | 4 mi | 180 ft | April 29 | May 11 | October 8 | – |
| Hudson, NH1 mi SSE | 5 mi | 185 ft | May 3 | May 16 | October 8 | 5b |
| East Milford, NH | 6 mi | 240 ft | April 28 | May 12 | October 8 | – |
| Milford, NH | 8 mi | 320 ft | May 3 | May 15 | 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 Nashua (2 mi NNW)
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 23 | May 16 | May 10 | April 30 | October 2 | September 21 |
| 32°F | May 11 | May 4 | April 30 | April 18 | October 12 | September 30 |
| 28°F (hard freeze) | April 29 | April 21 | April 17 | April 3 | October 24 | October 8 |
| 24°F | April 16 | April 8 | April 4 | March 23 | November 5 | October 22 |
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.