U.S. Frost Dates by Weather Station

NOAA station USC00331072 · Ohio

Frost Dates for Bucyrus, OH

NOAA weather station Bucyrus (USC00331072), Ohio · elevation 955 ft (291 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 6only 1 spring in 10 still has a frost later
  • Typical last frostApril 1950% chance of a frost after it
  • Typical first fall frostOctober 2750% chance of a frost before it
  • Frost-free season190 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Bucyrus, OHSpring: a frost after April 5 in 9 years out of 10, after April 19 in half of the years, after May 6 in 1 year out of 10. Fall: the first frost comes before October 14 in 1 year out of 10, before October 27 in half of the years, before November 10 in 9 years out of 10. Typical frost-free season: 190 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 19First frost ~Oct 27Frost season at Bucyrus, OHSpring: a frost after April 5 in 9 years out of 10, after April 19 in half of the years, after May 6 in 1 year out of 10. Fall: the first frost comes before October 14 in 1 year out of 10, before October 27 in half of the years, before November 10 in 9 years out of 10. Typical frost-free season: 190 days.JFMAMJJASONDLast frost ~Apr 19First frost ~Oct 27
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 6October 14
50% (typical)April 19October 27
90% (likely)April 5November 10
Frost-free season (32°F, 50% chance)
190 days
Hard frost (28°F), last in spring, 50% chance after
April 7
Hard frost (28°F), first in fall, 50% chance before
November 6

The last 15 years (2006–2020 normals)

Typical last frost April 18 (1 day earlier than the 30-year normal), typical first fall frost October 29 (2 days later). Frost-free season 192 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 Bucyrus: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 6, 20% April 30, 30% April 25, 40% April 22, 50% April 19, 60% April 17, 70% April 14, 80% April 10, 90% April 5. Observed last spring frost in recent years: 2021 April 23, 2022 April 29, 2023 April 20, 2024 April 26, 2025 April 18, 2026 April 9.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 6Apr 19Apr 52021: April 232022: April 292023: April 202024: April 262025: April 182026: April 9Fall at Bucyrus: chance of a frost before this dateFall, chance of a frost before the date: 10% October 14, 20% October 18, 30% October 22, 40% October 25, 50% October 27, 60% October 30, 70% November 1, 80% November 4, 90% November 10. Observed first fall frost in recent years: 2021 November 3, 2022 November 17, 2023 October 31, 2024 October 18, 2025 November 5.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 14Oct 27Nov 102021: November 32022: November 172023: October 312024: October 182025: November 5
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 23November 3
2022April 29November 17
2023April 20October 31
2024April 26October 18
2025April 18November 5
2026April 9season not over yet

What these dates mean

The 190 days between the 50% dates of April 19 and October 27 in Bucyrus define the period in which a light frost is equally likely to have occurred or not, giving gardeners a clear window for frost-free activity. The 50% date is April 19 in spring, indicating a 50% chance of a light frost later, and October 27 in fall, indicating a 50% chance of a light frost earlier. For a cautious spring plan, the date to set out tender crops is May 6, when there is only a 10% chance of a later frost; the risky early option is April 5 with a 90% chance. In fall, the cautious date to finish harvesting tender crops is October 14, carrying a 10% chance of an earlier frost, while November 10 represents the risky late option with a 90% chance. A hard frost, marked by the 28°F 50% dates of April 7 and November 6, matters more because temperatures that low can kill plants that would survive a 32°F light frost.

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 14" 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 Bucyrus, OHNumbered nearest stations: 1 — Marion, OH — 16 mi; 2 — near Mansfield, OH — 24 mi; 3 — Norwalk, OH — 36 mi; 4 — Findlay, OH — 39 mi; 5 — Findlay WPCC, OH — 40 mi.OH25 mi · 40 km1. Marion, OH — 16 mi12. near Mansfield, OH — 24 mi23. Norwalk, OH — 36 mi34. Findlay, OH — 39 mi45. Findlay WPCC, OH — 40 mi5
  1. Marion, OH 16 mi (26 km)
  2. near Mansfield, OH 24 mi (38 km)
  3. Norwalk, OH 36 mi (59 km)
  4. Findlay, OH 39 mi (63 km)
  5. Findlay WPCC, OH 40 mi (64 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: 40.8125, -82.9697.