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 01841
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 01841 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Lawrence, MA, is 1 miles from the ZIP's center: its last spring frost comes after April 21 in half of years and after May 1 in one year in ten. By the USDA's method its plant hardiness zone is 6b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Lawrence, MALawrence Municipal Airport | 1 mi | 149 ft | April 21 | May 1 | October 21 | 6b |
| Lawrence station, MA | 1 mi | 50 ft | April 13 | April 29 | October 28 | 6b |
| Haverhill, MA | 5 mi | 20 ft | May 1 | May 14 | October 12 | 6b |
| Groveland, MA | 6 mi | 30 ft | May 3 | May 17 | October 8 | 6a |
| Middleton, MA | 11 mi | 110 ft | May 3 | May 20 | October 9 | 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 Lawrence
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 16 | May 7 | May 3 | April 23 | October 9 | September 29 |
| 32°F | May 1 | April 25 | April 21 | April 9 | October 21 | October 6 |
| 28°F (hard freeze) | April 20 | April 13 | April 7 | March 29 | November 1 | October 19 |
| 24°F | April 7 | April 2 | March 29 | March 13 | November 15 | November 1 |
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.