U.S. Frost Dates by Weather Station

NOAA station USC00333375 · Ohio

Frost Dates for Greenville, OH

NOAA weather station Greenville WTP (USC00333375), Ohio · elevation 1030 ft (314 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 7only 1 spring in 10 still has a frost later
  • Typical last frostApril 2150% chance of a frost after it
  • Typical first fall frostOctober 2050% chance of a frost before it
  • Frost-free season180 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Greenville, OHSpring: a frost after April 7 in 9 years out of 10, after April 21 in half of the years, after May 7 in 1 year out of 10. Fall: the first frost comes before October 6 in 1 year out of 10, before October 20 in half of the years, before November 1 in 9 years out of 10. Typical frost-free season: 180 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 21First frost ~Oct 20Frost season at Greenville, OHSpring: a frost after April 7 in 9 years out of 10, after April 21 in half of the years, after May 7 in 1 year out of 10. Fall: the first frost comes before October 6 in 1 year out of 10, before October 20 in half of the years, before November 1 in 9 years out of 10. Typical frost-free season: 180 days.JFMAMJJASONDLast frost ~Apr 21First frost ~Oct 20
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)May 7October 6
50% (typical)April 21October 20
90% (likely)April 7November 1
Frost-free season (32°F, 50% chance)
180 days
Hard frost (28°F), last in spring, 50% chance after
April 9
Hard frost (28°F), first in fall, 50% chance before
October 31

The last 15 years (2006–2020 normals)

Typical last frost April 21 (same as the 30-year normal), typical first fall frost October 21 (1 day later). Frost-free season 181 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 Greenville: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 7, 20% May 1, 30% April 27, 40% April 24, 50% April 21, 60% April 19, 70% April 16, 80% April 12, 90% April 7. Observed last spring frost in recent years: 2021 May 11, 2022 April 27, 2023 April 27, 2024 April 22, 2025 April 17, 2026 April 22.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 7Apr 21Apr 72021: May 112022: April 272023: April 272024: April 222025: April 172026: April 22Fall at Greenville: chance of a frost before this dateFall, chance of a frost before the date: 10% October 6, 20% October 11, 30% October 14, 40% October 17, 50% October 20, 60% October 22, 70% October 25, 80% October 28, 90% November 1. Observed first fall frost in recent years: 2021 October 27, 2022 October 8, 2023 October 23, 2024 October 17, 2025 October 24.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 6Oct 20Nov 12021: October 272022: October 82023: October 232024: October 172025: October 24
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
2021May 11October 27
2022April 27October 8
2023April 27October 23
2024April 22October 17
2025April 17October 24
2026April 22season not over yet

What these dates mean

Setting out tender crops on the early spring date of April 7 is a gamble, because a frost later than that day occurs about 90 % of the time in Greenville.

A cautious gardener would wait for the May 7 date, which carries only a 10 % chance of a later frost, and would aim to finish harvesting tender crops by the October 6 cautious fall date, also with a 10 % chance of an earlier frost. The median light-frost dates are April 21 in spring and October 20 in fall; on each of those days there is an even, 50 % chance that a frost will occur later (spring) or earlier (fall).

Hard-frost dates of April 9 and October 31 mark the 50 % points for temperatures of 28 °F, and those temperatures can damage plants that survive a light frost, so they are 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 7" 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 Greenville, OHNumbered nearest stations: 1 — Eaton, OH — 26 mi; 2 — Dayton, OH — 27 mi; 3 — Farmland, IN — 28 mi; 4 — Sidney, OH — 29 mi; 5 — Celina, OH — 33 mi.OHIN25 mi · 40 km1. Eaton, OH — 26 mi12. Dayton, OH — 27 mi23. Farmland, IN — 28 mi34. Sidney, OH — 29 mi45. Celina, OH — 33 mi5
  1. Eaton, OH 26 mi (41 km)
  2. Dayton, OH 27 mi (43 km)
  3. Farmland, IN 28 mi (46 km)
  4. Sidney, OH 29 mi (46 km)
  5. Celina, OH 33 mi (53 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: 40.1033, -84.6503.