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 02189
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 02189 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Hingham, MA, is 1 miles from the ZIP's center: its last spring frost comes after April 25 in half of years and after May 8 in one year in ten. By the USDA's method its plant hardiness zone is 7a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Hingham, MA | 1 mi | 35 ft | April 25 | May 8 | October 22 | 7a |
| Blue Hill, MA | 9 mi | 625 ft | April 19 | May 1 | October 24 | 6b |
| Blue Hill Cooperative, MA | 9 mi | 625 ft | April 18 | April 30 | October 26 | – |
| Boston, MABoston Logan International Airport | 11 mi | 12 ft | April 4 | April 17 | November 9 | 7a |
| Jamaica Plain, MA | 12 mi | 95 ft | April 19 | May 3 | October 23 | 6b |
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 Hingham
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 20 | May 11 | May 6 | April 26 | October 9 | September 28 |
| 32°F | May 8 | April 30 | April 25 | April 13 | October 22 | October 6 |
| 28°F (hard freeze) | April 24 | April 16 | April 10 | March 29 | November 2 | October 19 |
| 24°F | April 10 | April 2 | March 30 | March 14 | November 15 | November 2 |
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.