Frost Dates for 02343 — Holbrook, Massachusetts

Half of springs at Blue Hill Coop, MA see their last 32°F night by April 18; only one in ten is past it by April 7, and one in ten still has one after April 30. Planting tender crops after April 22 leaves a 30% risk of a frost on them, after April 25 20%, and after April 30 10%. The 12 days between the even-odds date and the one-in-ten date is narrower than at 83% of the 71 Massachusetts stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 26 in half of years, as early as October 9 one year in ten, and holds off past November 8 one year in ten. A hard freeze of 28°F follows 10 days later, around November 5; in spring the one-in-ten date for 28°F is April 18, 12 days before the 32°F one. The freeze-free season lasts 190 days in a typical year, longer than at 83% of the 71 Massachusetts stations; it reaches 207 days one year in ten and falls short of 170 one year in ten. On average 121 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 12 days longer, to about April 30, and return around October 14. Severe cold of 16°F or below comes every winter, usually between December 8 and March 13.

July is the warmest month at Blue Hill Coop, MA, averaging 82°F by day and 64°F at night; January is the coldest at 35°F and 18°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month.

Warmth for growing adds up to 2,799 growing degree days a year (base 50°F), more than at 72% of the 71 Massachusetts stations. 30% of them (828) have built up by the end of June, and July adds the most, 705. Precipitation totals 53.9 inches a year, most in March (5.5") and least in July (3.5"); May to September bring 37% of it.

The nearest other station, Brockton, MA, 7 miles south of Holbrook and 550 feet lower, has a last frost 4 days later (April 22), a first frost 7 days earlier (October 19), a season 12 days shorter.

The first measurable snow (0.1 inch or more) in Holbrook usually arrives around November 14, and the last of the season around April 6. Those are the middle dates across the winters of 1991–2020 at Blue Hill Coop, MA, 6.9 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 12 days after the last snow.

ZIP 02343 is 7 miles from Blue Hill Coop, MA, which stands at 625 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 02136 (Hyde Park). The 2023 USDA Plant Hardiness Zone Map lists ZIP 02343 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.