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 01128
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 01128 in zone 6a (the coldest night of a typical year: -10 to -5°F).
The nearest station, Westfield, MA, is 12 miles from the ZIP's center: its last spring frost comes after May 3 in half of years and after May 17 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 |
|---|---|---|---|---|---|---|
| Westfield, MAWestfield-Barnes Regional Airport | 12 mi | 271 ft | May 3 | May 17 | October 8 | 6a |
| Staffordville, CT | 13 mi | 736 ft | May 7 | May 21 | October 12 | 6a |
| Hartford, CTHartford-Bradley International Airport | 15 mi | 190 ft | April 21 | May 6 | October 16 | 6b |
| Belchertown, MA | 15 mi | 550 ft | May 3 | May 16 | October 14 | – |
| Westfield (3 mi SW), MA | 16 mi | 430 ft | April 28 | May 11 | October 17 | – |
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 Westfield
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 28 | May 20 | May 14 | May 1 | September 30 | September 16 |
| 32°F | May 17 | May 9 | May 3 | April 20 | October 8 | September 26 |
| 28°F (hard freeze) | May 5 | April 27 | April 21 | April 6 | October 20 | October 6 |
| 24°F | April 21 | April 12 | April 5 | March 23 | November 2 | October 17 |
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.