U.S. Frost Dates by Weather Station

NOAA station USC00193821 · Massachusetts

Frost Dates for Hyannis, MA

NOAA weather station Hyannis (USC00193821), Massachusetts · elevation 60 ft (18 m) · hardiness zone 7a*

  • Lower-risk planting dateafter April 30only 1 spring in 10 still has a frost later
  • Typical last frostApril 1650% chance of a frost after it
  • Typical first fall frostOctober 3050% chance of a frost before it
  • Frost-free season195 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Hyannis, MASpring: a frost after April 5 in 9 years out of 10, after April 16 in half of the years, after April 30 in 1 year out of 10. Fall: the first frost comes before October 15 in 1 year out of 10, before October 30 in half of the years, before November 13 in 9 years out of 10. Typical frost-free season: 195 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 16First frost ~Oct 30Frost season at Hyannis, MASpring: a frost after April 5 in 9 years out of 10, after April 16 in half of the years, after April 30 in 1 year out of 10. Fall: the first frost comes before October 15 in 1 year out of 10, before October 30 in half of the years, before November 13 in 9 years out of 10. Typical frost-free season: 195 days.JFMAMJJASONDLast frost ~Apr 16First frost ~Oct 30
frost likely chance fading 90% → 10% frost-free in a typical yearThe year at a glance. Blue: frost is likely; the gradient fades as the chance drops from 90% to 10%; green: the frost-free part of a typical year.

Frost dates (32°F)

Probability of frost, based on 28 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)April 30October 15
50% (typical)April 16October 30
90% (likely)April 5November 13
Frost-free season (32°F, 50% chance)
195 days
Hard frost (28°F), last in spring, 50% chance after
April 3
Hard frost (28°F), first in fall, 50% chance before
November 11

The last 15 years (2006–2020 normals)

Typical last frost April 13 (3 days earlier than the 30-year normal), typical first fall frost November 3 (4 days later). Frost-free season 205 days.

A shorter, more recent NOAA period. The 30-year normals above remain the main reference: 15 years carry more year-to-year noise.

Add these dates to your calendar Yearly reminders for the typical last frost, the lower-risk planting date and the typical first fall frost (.ics).

How the chance of frost changes with the date

Spring at Hyannis: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 30, 20% April 25, 30% April 22, 40% April 19, 50% April 16, 60% April 13, 70% April 10, 80% April 8, 90% April 5. Observed last spring frost in recent years: 2021 April 4, 2022 April 1, 2023 April 5, 2025 April 19, 2026 April 25.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 30Apr 16Apr 52021: April 42022: April 12023: April 52025: April 192026: April 25Fall at Hyannis: chance of a frost before this dateFall, chance of a frost before the date: 10% October 15, 20% October 20, 30% October 24, 40% October 27, 50% October 30, 60% November 1, 70% November 4, 80% November 7, 90% November 13. Observed first fall frost in recent years: 2021 November 6, 2022 November 19, 2024 October 29, 2025 November 7.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 15Oct 30Nov 132021: November 62022: November 192024: October 292025: November 7
Two charts, because spring and fall answer different questions: in spring, the chance that a frost still comes after a date; in fall, the chance that the first frost has already come before it. NOAA publishes these odds from 10% to 90%, so the lines stop there. ◆ marks the actual date in each recent year.

What actually happened in recent years

Observed dates of the last spring and first fall frost (32°F) at this station; ◆ marks them on the charts above
YearLast spring frostFirst fall frost
2021April 4November 6
2022April 1November 19
2023April 5incomplete record
2024incomplete recordOctober 29
2025April 19November 7
2026April 25season not over yet

What these dates mean

The cautious fall date in Hyannis for finishing the harvest is October 15, when there is only a 10% chance that a light frost has arrived.

For light-frost risk, the 50% dates are April 16 in spring and October 30 in fall; at each of these dates a gardener faces even odds of a frost occurring later (spring) or earlier (fall). The 50% hard-frost dates are April 3 and November 11, and a hard frost can damage plant tissue that survives a light frost, so it is a more serious concern.

A cautious spring plan therefore uses the late light-frost date of April 30, which carries only a 10% chance of a frost later, while a cautious fall plan uses the early light-frost date of October 15, which carries only a 10% chance of a frost earlier.

How to read the probabilities

The dates are probabilities from 30 years of weather, not a forecast for this year.

  • Spring: "10% after April 30" means that in about one spring out of ten a frost still happens after that date. The 90% date is the earliest: a frost after it happens in most years.
  • Fall: "10% before October 15" means that in about one fall out of ten the first frost arrives before that date.
  • 50% is the typical date: half of the years are earlier, half are later.
  • A light frost (32°F) damages tender plants; a hard frost (28°F) also stops most hardy vegetables.

Nearby weather stations

Map of weather stations near Hyannis, MANumbered nearest stations: 1 — Chatham, MA — 18 mi; 2 — Edgartown, MA — 22 mi; 3 — Rochester, MA — 33 mi; 4 — Hingham, MA — 50 mi; 5 — Blue Hill Coop, MA — 56 mi.RICT25 mi · 40 km1. Chatham, MA — 18 mi12. Edgartown, MA — 22 mi23. Rochester, MA — 33 mi34. Hingham, MA — 50 mi45. Blue Hill Coop, MA — 56 mi5
  1. Chatham, MA 18 mi (29 km)
  2. Edgartown, MA 22 mi (36 km)
  3. Rochester, MA 33 mi (53 km)
  4. Hingham, MA 50 mi (80 km)
  5. Blue Hill Coop, MA 56 mi (90 km)

Sources

* Hardiness zone 7a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 41.665, -70.3039.