U.S. Frost Dates by Weather Station

NOAA station USC00193624 · Massachusetts

Frost Dates for Hingham, MA

NOAA weather station Hingham (USC00193624), Massachusetts · elevation 35 ft (11 m) · hardiness zone 7a*

  • Lower-risk planting dateafter May 8only 1 spring in 10 still has a frost later
  • Typical last frostApril 2550% chance of a frost after it
  • Typical first fall frostOctober 2250% chance of a frost before it
  • Frost-free season177 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Hingham, MASpring: a frost after April 13 in 9 years out of 10, after April 25 in half of the years, after May 8 in 1 year out of 10. Fall: the first frost comes before October 6 in 1 year out of 10, before October 22 in half of the years, before November 5 in 9 years out of 10. Typical frost-free season: 177 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 25First frost ~Oct 22Frost season at Hingham, MASpring: a frost after April 13 in 9 years out of 10, after April 25 in half of the years, after May 8 in 1 year out of 10. Fall: the first frost comes before October 6 in 1 year out of 10, before October 22 in half of the years, before November 5 in 9 years out of 10. Typical frost-free season: 177 days.JFMAMJJASONDLast frost ~Apr 25First frost ~Oct 22
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 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 8October 6
50% (typical)April 25October 22
90% (likely)April 13November 5
Frost-free season (32°F, 50% chance)
177 days
Hard frost (28°F), last in spring, 50% chance after
April 10
Hard frost (28°F), first in fall, 50% chance before
November 2

The last 15 years (2006–2020 normals)

Typical last frost April 22 (3 days earlier than the 30-year normal), typical first fall frost October 26 (4 days later). Frost-free season 184 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 Hingham: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 8, 20% May 3, 30% April 30, 40% April 28, 50% April 25, 60% April 23, 70% April 20, 80% April 18, 90% April 13. Observed last spring frost in recent years: 2021 April 22, 2022 April 21, 2023 April 10, 2025 April 18, 2026 April 25.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 8Apr 25Apr 132021: April 222022: April 212023: April 102025: April 182026: April 25Fall at Hingham: chance of a frost before this dateFall, chance of a frost before the date: 10% October 6, 20% October 11, 30% October 15, 40% October 19, 50% October 22, 60% October 25, 70% October 28, 80% November 1, 90% November 5. Observed first fall frost in recent years: 2021 November 3, 2022 October 29, 2023 November 1, 2024 October 29, 2025 October 27.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 6Oct 22Nov 52021: November 32022: October 292023: November 12024: October 292025: October 27
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 22November 3
2022April 21October 29
2023April 10November 1
2024incomplete recordOctober 29
2025April 18October 27
2026April 25season not over yet

What these dates mean

The cautious fall date in Hingham for finishing the harvest is October 6, when there is a 10% chance a light frost has arrived earlier. That date marks a point at which a light frost is still unlikely, while any later date carries a higher risk.

The 50% light-frost dates are April 25 in spring and October 22 in fall; at each of those dates a gardener has an even chance of a frost occurring later (spring) or earlier (fall). A cautious planting plan therefore uses the May 8 light-frost date, which carries only a 10% chance of frost later, for setting out tender crops in spring, and the October 6 light-frost date for concluding the harvest in fall. The 50% hard-frost dates are April 10 and November 2, and a hard frost (28 °F) can damage plants that survive a light frost, making it a more serious threat.

How to read the probabilities

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

  • Spring: "10% after May 8" 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 6" 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 Hingham, MANumbered nearest stations: 1 — Blue Hill Coop, MA — 10 mi; 2 — near Boston, MA — 11 mi; 3 — Jamaica Plain, MA — 12 mi; 4 — Marblehead, MA — 19 mi; 5 — Reading, MA — 23 mi.NHCTRIVT25 mi · 40 km1. Blue Hill Coop, MA — 10 mi12. near Boston, MA — 11 mi23. Jamaica Plain, MA — 12 mi34. Marblehead, MA — 19 mi45. Reading, MA — 23 mi5
  1. Blue Hill Coop, MA 10 mi (17 km)
  2. near Boston, MA 11 mi (17 km)
  3. Jamaica Plain, MA 12 mi (19 km)
  4. Marblehead, MA 19 mi (31 km)
  5. Reading, MA 23 mi (37 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: 42.2269, -70.9125.