U.S. Frost Dates by Weather Station

NOAA station USC00060227 · Connecticut

Frost Dates for Bakersville, CT

NOAA weather station Bakersville (USC00060227), Connecticut · elevation 686 ft (209 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 22only 1 spring in 10 still has a frost later
  • Typical last frostMay 850% chance of a frost after it
  • Typical first fall frostOctober 550% chance of a frost before it
  • Frost-free season151 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Bakersville, CTSpring: a frost after April 24 in 9 years out of 10, after May 8 in half of the years, after May 22 in 1 year out of 10. Fall: the first frost comes before September 25 in 1 year out of 10, before October 5 in half of the years, before October 21 in 9 years out of 10. Typical frost-free season: 151 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 8First frost ~Oct 5Frost season at Bakersville, CTSpring: a frost after April 24 in 9 years out of 10, after May 8 in half of the years, after May 22 in 1 year out of 10. Fall: the first frost comes before September 25 in 1 year out of 10, before October 5 in half of the years, before October 21 in 9 years out of 10. Typical frost-free season: 151 days.JFMAMJJASONDLast frost ~May 8First frost ~Oct 5
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 29 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 22September 25
50% (typical)May 8October 5
90% (likely)April 24October 21
Frost-free season (32°F, 50% chance)
151 days
Hard frost (28°F), last in spring, 50% chance after
April 26
Hard frost (28°F), first in fall, 50% chance before
October 18

The last 15 years (2006–2020 normals)

Typical last frost May 3 (5 days earlier than the 30-year normal), typical first fall frost October 15 (10 days later). Frost-free season 160 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 Bakersville: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 22, 20% May 18, 30% May 14, 40% May 11, 50% May 8, 60% May 4, 70% May 1, 80% April 29, 90% April 24. Observed last spring frost in recent years: 2021 April 24, 2022 May 2, 2023 May 19, 2024 April 28, 2025 April 22, 2026 April 26.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1May 22May 8Apr 242021: April 242022: May 22023: May 192024: April 282025: April 222026: April 26Fall at Bakersville: chance of a frost before this dateFall, chance of a frost before the date: 10% September 25, 20% September 30, 30% October 1, 40% October 3, 50% October 5, 60% October 8, 70% October 11, 80% October 15, 90% October 21. Observed first fall frost in recent years: 2021 November 3, 2022 October 9, 2023 October 24, 2024 October 17, 2025 October 10.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Sep 25Oct 5Oct 212021: November 32022: October 92023: October 242024: October 172025: October 10
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 24November 3
2022May 2October 9
2023May 19October 24
2024April 28October 17
2025April 22October 10
2026April 26season not over yet

What these dates mean

May 22, the cautious spring date with a 10 % chance of a later light frost, lets a gardener set out tender crops after the risk of a light freeze has dropped low enough for confident planting. The 50 % date of May 8 marks the point where a light frost is as likely as not, giving a clear sense of the median timing for frost risk in spring.

In fall, September 25 serves as the cautious date, having only a 10 % chance that a light frost has already arrived, and therefore signals when a gardener can finish harvesting tender crops with minimal frost threat. The median fall date of October 5 indicates an even odds point for a light frost occurring earlier. The hard-frost 50 % dates, April 26 in spring and October 18 in fall, highlight when a 28 °F freeze is as likely as not, and hard frosts matter more than light frosts because the lower temperature can cause more severe plant damage.

How to read the probabilities

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

  • Spring: "10% after May 22" 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 September 25" 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 Bakersville, CTNumbered nearest stations: 1 — Norfolk, CT — 14 mi; 2 — Hartford (Bradley Airport), CT — 18 mi; 3 — Hartford (Brainard Field), CT — 20 mi; 4 — Worthington, MA — 38 mi; 5 — Storrs, CT — 40 mi.MANYRINH25 mi · 40 km1. Norfolk, CT — 14 mi12. Hartford (Bradley Airport), CT — 18 mi23. Hartford (Brainard Field), CT — 20 mi34. Worthington, MA — 38 mi45. Storrs, CT — 40 mi5
  1. Norfolk, CT 14 mi (23 km)
  2. Hartford (Bradley Airport), CT 18 mi (29 km)
  3. Hartford (Brainard Field), CT 20 mi (32 km)
  4. Worthington, MA 38 mi (61 km)
  5. Storrs, CT 40 mi (65 km)

Sources

* Hardiness zone 6a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 41.8417, -73.0086.