U.S. Frost Dates by Weather Station

NOAA station USC00334979 · Ohio

Frost Dates for Marysville, OH

NOAA weather station Marysville (USC00334979), Ohio · elevation 970 ft (296 m) · hardiness zone 6b*

  • Lower-risk planting dateafter May 5only 1 spring in 10 still has a frost later
  • Typical last frostApril 1950% chance of a frost after it
  • Typical first fall frostOctober 2650% chance of a frost before it
  • Frost-free season188 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season at Marysville, OHSpring: a frost after April 5 in 9 years out of 10, after April 19 in half of the years, after May 5 in 1 year out of 10. Fall: the first frost comes before October 13 in 1 year out of 10, before October 26 in half of the years, before November 7 in 9 years out of 10. Typical frost-free season: 188 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 19First frost ~Oct 26Frost season at Marysville, OHSpring: a frost after April 5 in 9 years out of 10, after April 19 in half of the years, after May 5 in 1 year out of 10. Fall: the first frost comes before October 13 in 1 year out of 10, before October 26 in half of the years, before November 7 in 9 years out of 10. Typical frost-free season: 188 days.JFMAMJJASONDLast frost ~Apr 19First frost ~Oct 26
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 5October 13
50% (typical)April 19October 26
90% (likely)April 5November 7
Frost-free season (32°F, 50% chance)
188 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 27 (1 day later). Frost-free season 191 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 Marysville: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 5, 20% April 29, 30% April 25, 40% April 22, 50% April 19, 60% April 17, 70% April 13, 80% April 10, 90% April 5. Observed last spring frost in recent years: 2021 April 24, 2022 April 27, 2023 April 26, 2024 April 25, 2025 April 17, 2026 April 8.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 5Apr 19Apr 52021: April 242022: April 272023: April 262024: April 252025: April 172026: April 8Fall at Marysville: chance of a frost before this dateFall, chance of a frost before the date: 10% October 13, 20% October 18, 30% October 21, 40% October 24, 50% October 26, 60% October 29, 70% October 31, 80% November 3, 90% November 7. Observed first fall frost in recent years: 2021 November 3, 2022 October 20, 2023 October 23, 2024 October 17.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 13Oct 26Nov 72021: November 32022: October 202023: October 232024: October 17
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
2022April 27October 20
2023April 26October 23
2024April 25October 17
2025April 17incomplete record
2026April 8season not over yet

What these dates mean

Planting tender crops on April 5 in Marysville is a gamble, because there is a 90 % chance of a light frost occurring later. The cautious alternative is May 5, when only a 10 % chance of a light frost remains, giving gardeners a much lower risk for delicate seedlings.

The median, or 50 % date, for light frost in spring is April 19; at that point the odds of a frost later are evenly split. In the fall the cautious date to finish harvesting tender crops is October 13, when there is just a 10 % chance that a light frost has already arrived, while the 50 % date of October 26 marks an even chance of frost occurring earlier.

A hard frost at 28 °F can injure plants that would survive a light frost at 32 °F, so the 50 % hard-frost dates of April 7 and November 6 are especially relevant for protecting crops.

How to read the probabilities

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

  • Spring: "10% after May 5" 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 13" 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 Marysville, OHNumbered nearest stations: 1 — Westerville, OH — 18 mi; 2 — near Columbus, OH — 25 mi; 3 — Urbana, OH — 28 mi; 4 — Bellefontaine, OH — 29 mi; 5 — Marion, OH — 30 mi.25 mi · 40 km1. Westerville, OH — 18 mi12. near Columbus, OH — 25 mi23. Urbana, OH — 28 mi34. Bellefontaine, OH — 29 mi45. Marion, OH — 30 mi5
  1. Westerville, OH 18 mi (28 km)
  2. near Columbus, OH 25 mi (40 km)
  3. Urbana, OH 28 mi (45 km)
  4. Bellefontaine, OH 29 mi (47 km)
  5. Marion, OH 30 mi (48 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: 40.1939, -83.2675.