U.S. Frost Dates by Weather Station

NOAA station USC00335297 · Ohio

Frost Dates for Millersburg, OH

NOAA weather station Millersburg (USC00335297), Ohio · elevation 819 ft (250 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 21only 1 spring in 10 still has a frost later
  • Typical last frostMay 250% chance of a frost after it
  • Typical first fall frostOctober 1450% chance of a frost before it
  • Frost-free season164 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Millersburg, OHSpring: a frost after April 18 in 9 years out of 10, after May 2 in half of the years, after May 21 in 1 year out of 10. Fall: the first frost comes before October 1 in 1 year out of 10, before October 14 in half of the years, before October 27 in 9 years out of 10. Typical frost-free season: 164 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 2First frost ~Oct 14Frost season at Millersburg, OHSpring: a frost after April 18 in 9 years out of 10, after May 2 in half of the years, after May 21 in 1 year out of 10. Fall: the first frost comes before October 1 in 1 year out of 10, before October 14 in half of the years, before October 27 in 9 years out of 10. Typical frost-free season: 164 days.JFMAMJJASONDLast frost ~May 2First frost ~Oct 14
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.Today

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 21October 1
50% (typical)May 2October 14
90% (likely)April 18October 27
Frost-free season (32°F, 50% chance)
164 days
Hard frost (28°F), last in spring, 50% chance after
April 21
Hard frost (28°F), first in fall, 50% chance before
October 26

The last 15 years (2006–2020 normals)

Typical last frost May 1 (1 day earlier than the 30-year normal), typical first fall frost October 19 (5 days later). Frost-free season 167 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 Millersburg: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 21, 20% May 15, 30% May 10, 40% May 6, 50% May 2, 60% April 29, 70% April 26, 80% April 23, 90% April 18. Observed last spring frost in recent years: 2021 May 13, 2022 April 30, 2023 May 18, 2024 April 27, 2025 April 18, 2026 May 4.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1May 21May 2Apr 182021: May 132022: April 302023: May 182024: April 272025: April 182026: May 4Fall at Millersburg: chance of a frost before this dateFall, chance of a frost before the date: 10% October 1, 20% October 4, 30% October 7, 40% October 11, 50% October 14, 60% October 16, 70% October 19, 80% October 22, 90% October 27. Observed first fall frost in recent years: 2021 November 1, 2022 October 8, 2023 October 23, 2024 October 10, 2025 October 17.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 1Oct 14Oct 272021: November 12022: October 82023: October 232024: October 102025: 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
2021May 13November 1
2022April 30October 8
2023May 18October 23
2024April 27October 10
2025April 18October 17
2026May 4season not over yet

What these dates mean

Setting out tender crops on the early spring date of April 18 in Millersburg carries a 90 % chance of a frost and is therefore a gamble. The cautious spring date for tender crops is May 21, when only a 10 % chance of a later frost remains.

The 50% date in spring is May 2, which marks a 50 % chance of a frost later than this date, while the 50% date in fall is October 14, indicating a 50 % chance of a frost earlier than this date. The hard-frost 50% dates are April 21 in spring and October 26 in fall; these are the points at which a frost of 28 °F is as likely as not. The cautious fall date for finishing tender crops is October 1, with only a 10 % chance that a frost has arrived earlier.

A hard frost at 28 °F can injure plants that would survive a light frost at 32 °F, making those dates especially significant for growers.

How to read the probabilities

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

  • Spring: "10% after May 21" 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 1" 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 Millersburg, OHNumbered nearest stations: 1 — Wooster, OH — 17 mi; 2 — Danville, OH — 21 mi; 3 — Dennison, OH — 32 mi; 4 — near Akron, OH — 37 mi; 5 — near Mansfield, OH — 37 mi.OH25 mi · 40 km1. Wooster, OH — 17 mi12. Danville, OH — 21 mi23. Dennison, OH — 32 mi34. near Akron, OH — 37 mi45. near Mansfield, OH — 37 mi5
  1. Wooster, OH 17 mi (27 km)
  2. Danville, OH 21 mi (34 km)
  3. Dennison, OH 32 mi (51 km)
  4. near Akron, OH 37 mi (59 km)
  5. near Mansfield, OH 37 mi (59 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: 40.5375, -81.9197.