U.S. Frost Dates by Weather Station

NOAA station USC00332791 · Ohio

Frost Dates for Findlay WPCC, OH

NOAA weather station Findlay WPCC (USC00332791), Ohio · elevation 768 ft (234 m) · hardiness zone 6b*

  • Lower-risk planting dateafter May 6only 1 spring in 10 still has a frost later
  • Typical last frostApril 2250% chance of a frost after it
  • Typical first fall frostOctober 2450% chance of a frost before it
  • Frost-free season183 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season at Findlay WPCC, OHSpring: a frost after April 9 in 9 years out of 10, after April 22 in half of the years, after May 6 in 1 year out of 10. Fall: the first frost comes before October 10 in 1 year out of 10, before October 24 in half of the years, before November 4 in 9 years out of 10. Typical frost-free season: 183 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 22First frost ~Oct 24Frost season at Findlay WPCC, OHSpring: a frost after April 9 in 9 years out of 10, after April 22 in half of the years, after May 6 in 1 year out of 10. Fall: the first frost comes before October 10 in 1 year out of 10, before October 24 in half of the years, before November 4 in 9 years out of 10. Typical frost-free season: 183 days.JFMAMJJASONDLast frost ~Apr 22First frost ~Oct 24
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 6October 10
50% (typical)April 22October 24
90% (likely)April 9November 4
Frost-free season (32°F, 50% chance)
183 days
Hard frost (28°F), last in spring, 50% chance after
April 11
Hard frost (28°F), first in fall, 50% chance before
November 3

The last 15 years (2006–2020 normals)

Typical last frost April 21 (1 day earlier than the 30-year normal), typical first fall frost October 25 (1 day later). Frost-free season 185 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 Findlay WPCC: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 6, 20% May 2, 30% April 29, 40% April 25, 50% April 22, 60% April 20, 70% April 17, 80% April 14, 90% April 9. Observed last spring frost in recent years: 2021 May 1, 2022 April 28, 2023 May 2, 2024 April 25, 2025 April 17, 2026 May 3.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 6Apr 22Apr 92021: May 12022: April 282023: May 22024: April 252025: April 172026: May 3Fall at Findlay WPCC: chance of a frost before this dateFall, chance of a frost before the date: 10% October 10, 20% October 15, 30% October 19, 40% October 21, 50% October 24, 60% October 26, 70% October 28, 80% November 1, 90% November 4. Observed first fall frost in recent years: 2021 November 3, 2022 October 29, 2023 October 30, 2024 October 17, 2025 October 25.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 10Oct 24Nov 42021: November 32022: October 292023: October 302024: October 172025: October 25
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 1November 3
2022April 28October 29
2023May 2October 30
2024April 25October 17
2025April 17October 25
2026May 3season not over yet

What these dates mean

The 183 days between the 32 °F 50% dates of April 22 and October 24 in Findlay WPCC give a window in which light-frost risk is low enough for most tender crops.

April 22 is the 50% date, meaning there is a 50% chance of a light frost later than this date, while October 24 is the 50% date with a 50% chance of a light frost earlier than this date. For a cautious spring plan, the May 6 date carries only a 10% chance of a later frost and is the recommended point to set out tender crops; in the fall the cautious date is October 10, when the chance of an earlier frost is just 10%.

Hard frost at 28 °F is more damaging than a 32 °F light frost, so the hard-frost dates of April 11 and November 3 provide the thresholds where the risk of serious plant injury rises sharply.

How to read the probabilities

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

  • Spring: "10% after May 6" 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 10" 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 Findlay WPCC, OHNumbered nearest stations: 1 — Findlay, OH — 2 mi; 2 — Pandora, OH — 17 mi; 3 — Bowling Green, OH — 23 mi; 4 — Lima, OH — 33 mi; 5 — near Toledo, OH — 38 mi.INMI25 mi · 40 km1. Findlay, OH — 2 mi12. Pandora, OH — 17 mi23. Bowling Green, OH — 23 mi34. Lima, OH — 33 mi45. near Toledo, OH — 38 mi5
  1. Findlay, OH 2 mi (4 km)
  2. Pandora, OH 17 mi (27 km)
  3. Bowling Green, OH 23 mi (38 km)
  4. Lima, OH 33 mi (53 km)
  5. near Toledo, OH 38 mi (61 km)

Sources

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

Station coordinates: 41.0461, -83.6622.