U.S. Frost Dates by Weather Station

NOAA station USC00336405 · Ohio

Frost Dates for Pandora, OH

NOAA weather station Pandora (USC00336405), Ohio · elevation 770 ft (235 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 9only 1 spring in 10 still has a frost later
  • Typical last frostApril 2350% chance of a frost after it
  • Typical first fall frostOctober 2250% chance of a frost before it
  • Frost-free season180 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Pandora, OHSpring: a frost after April 10 in 9 years out of 10, after April 23 in half of the years, after May 9 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 4 in 9 years out of 10. Typical frost-free season: 180 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 23First frost ~Oct 22Frost season at Pandora, OHSpring: a frost after April 10 in 9 years out of 10, after April 23 in half of the years, after May 9 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 4 in 9 years out of 10. Typical frost-free season: 180 days.JFMAMJJASONDLast frost ~Apr 23First 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 9October 6
50% (typical)April 23October 22
90% (likely)April 10November 4
Frost-free season (32°F, 50% chance)
180 days
Hard frost (28°F), last in spring, 50% chance after
April 14
Hard frost (28°F), first in fall, 50% chance before
November 2

The last 15 years (2006–2020 normals)

Typical last frost April 23 (same as the 30-year normal), typical first fall frost October 23 (1 day later). Frost-free season 182 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 Pandora: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 9, 20% May 3, 30% April 30, 40% April 26, 50% April 23, 60% April 20, 70% April 17, 80% April 14, 90% April 10. Observed last spring frost in recent years: 2021 April 22, 2022 April 27, 2023 April 27, 2024 April 25, 2025 April 17, 2026 May 2.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 9Apr 23Apr 102021: April 222022: April 272023: April 272024: April 252025: April 172026: May 2Fall at Pandora: chance of a frost before this dateFall, chance of a frost before the date: 10% October 6, 20% October 12, 30% October 16, 40% October 19, 50% October 22, 60% October 25, 70% October 28, 80% October 31, 90% November 4. Observed first fall frost in recent years: 2021 October 27, 2022 October 8, 2023 October 23, 2024 October 16, 2025 October 25.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 6Oct 22Nov 42021: October 272022: October 82023: October 232024: October 162025: 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
2021April 22October 27
2022April 27October 8
2023April 27October 23
2024April 25October 16
2025April 17October 25
2026May 2season not over yet

What these dates mean

May 9 is the cautious spring date for Pandora, Ohio, carrying only a 10% chance of a light frost later; it lets a gardener set out tender crops with minimal risk.

The 50% date is April 23, where there is an even chance of a frost later than this date, and the opposite 50% date in fall is October 22, with an even chance of a frost earlier than this date. The 50% hard-frost dates are April 14 and November 2, marking the median moments when temperatures reach 28 °F, a level that can injure or kill plants more severely than a light frost.

October 6 is the cautious fall date, with only a 10% chance that a light frost has arrived earlier, allowing a gardener to finish harvesting tender crops. Hard frost matters more than light frost because the colder 28 °F threshold can cause greater damage to plant tissue.

How to read the probabilities

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

  • Spring: "10% after May 9" 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 Pandora, OHNumbered nearest stations: 1 — Findlay, OH — 16 mi; 2 — Findlay WPCC, OH — 17 mi; 3 — Lima, OH — 18 mi; 4 — Defiance, OH — 32 mi; 5 — Bowling Green, OH — 35 mi.INMI25 mi · 40 km1. Findlay, OH — 16 mi12. Findlay WPCC, OH — 17 mi23. Lima, OH — 18 mi34. Defiance, OH — 32 mi45. Bowling Green, OH — 35 mi5
  1. Findlay, OH 16 mi (26 km)
  2. Findlay WPCC, OH 17 mi (27 km)
  3. Lima, OH 18 mi (28 km)
  4. Defiance, OH 32 mi (51 km)
  5. Bowling Green, OH 35 mi (57 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: 40.9461, -83.9614.