Frost Dates for 02675 — Yarmouth Port, Massachusetts

Half of springs at Hyannis Barnstable Municipal Airport, MA see their last 32°F night by April 22; only one in ten is past it by April 9, and one in ten still has one after May 5. Planting tender crops after April 27 leaves a 30% risk of a frost on them, after April 30 20%, and after May 5 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 51% of the 71 Massachusetts stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 28 in half of years, as early as October 13 one year in ten, and holds off past November 11 one year in ten. A hard freeze of 28°F follows 12 days later, around November 9; in spring the one-in-ten date for 28°F is April 21, 14 days before the 32°F one. The freeze-free season lasts 188 days in a typical year, longer than at 82% of the 71 Massachusetts stations; it reaches 210 days one year in ten and falls short of 168 one year in ten. On average 109 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 11 days longer, to about May 3, and return around October 14. Severe cold of 16°F or below comes every winter, usually between December 21 and March 3.

July is the warmest month at Hyannis Barnstable Municipal Airport, MA, averaging 81°F by day and 65°F at night; January is the coldest at 40°F and 24°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 20% of years.

Warmth for growing adds up to 2,764 growing degree days a year (base 50°F), more than at 65% of the 71 Massachusetts stations. 27% of them (733) have built up by the end of June, and July adds the most, 707. Precipitation totals 44.8 inches a year, most in December (4.7") and least in July (2.7"); May to September bring 37% of it.

The nearest other station, Hyannis, MA, 5 miles southwest of Yarmouth Port, has a last frost 6 days earlier (April 16), a first frost 2 days later (October 30), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Yarmouth Port usually arrives around January 2, and the last of the season around March 6. Those are the middle dates across the winters of 1991–2020 at Hyannis, MA, 4.9 miles away: half of years saw snow earlier, half later. Snow fell in 86% of those winters. The last 32°F night of spring typically comes 47 days after the last snow.

ZIP 02675 is 4 miles from Hyannis Barnstable Municipal Airport, MA, which stands at 55 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 02664 (South Yarmouth). The 2023 USDA Plant Hardiness Zone Map lists ZIP 02675 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.