U.S. Frost Dates by Weather Station

NOAA station USC00369367 · Pennsylvania

Frost Dates for Waynesburg, PA

NOAA weather station Waynesburg 1 E (USC00369367), Pennsylvania · elevation 940 ft (287 m) · hardiness zone 6b*

  • Lower-risk planting dateafter May 21only 1 spring in 10 still has a frost later
  • Typical last frostMay 350% chance of a frost after it
  • Typical first fall frostOctober 1550% chance of a frost before it
  • Frost-free season164 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season at Waynesburg, PASpring: a frost after April 19 in 9 years out of 10, after May 3 in half of the years, after May 21 in 1 year out of 10. Fall: the first frost comes before October 2 in 1 year out of 10, before October 15 in half of the years, before October 28 in 9 years out of 10. Typical frost-free season: 164 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 3First frost ~Oct 15Frost season at Waynesburg, PASpring: a frost after April 19 in 9 years out of 10, after May 3 in half of the years, after May 21 in 1 year out of 10. Fall: the first frost comes before October 2 in 1 year out of 10, before October 15 in half of the years, before October 28 in 9 years out of 10. Typical frost-free season: 164 days.JFMAMJJASONDLast frost ~May 3First frost ~Oct 15
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 21October 2
50% (typical)May 3October 15
90% (likely)April 19October 28
Frost-free season (32°F, 50% chance)
164 days
Hard frost (28°F), last in spring, 50% chance after
April 22
Hard frost (28°F), first in fall, 50% chance before
October 25

The last 15 years (2006–2020 normals)

Typical last frost May 2 (1 day earlier than the 30-year normal), typical first fall frost October 20 (5 days later). Frost-free season 170 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 Waynesburg: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 21, 20% May 15, 30% May 11, 40% May 7, 50% May 3, 60% April 30, 70% April 28, 80% April 24, 90% April 19. Observed last spring frost in recent years: 2021 May 13, 2022 April 30, 2023 April 28, 2024 April 26, 2025 April 18, 2026 May 3.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1May 21May 3Apr 192021: May 132022: April 302023: April 282024: April 262025: April 182026: May 3Fall at Waynesburg: chance of a frost before this dateFall, chance of a frost before the date: 10% October 2, 20% October 6, 30% October 10, 40% October 13, 50% October 15, 60% October 17, 70% October 20, 80% October 24, 90% October 28. Observed first fall frost in recent years: 2021 November 3, 2022 October 9, 2023 October 23, 2024 October 11, 2025 October 17.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 2Oct 15Oct 282021: November 32022: October 92023: October 232024: October 112025: 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 3
2022April 30October 9
2023April 28October 23
2024April 26October 11
2025April 18October 17
2026May 3season not over yet

What these dates mean

May 21 is the cautious spring date for light frost in Waynesburg; with only a 10 % chance of a frost later, it lets a gardener set out tender crops with low risk.

The 50 % date in spring is May 3, which marks a 50 % chance of a light frost later than that day, while the 50 % date in fall is October 15, indicating a 50 % chance of a light frost earlier than that day. For a careful fall schedule, October 2 is the cautious date, offering only a 10 % chance that a frost has arrived earlier, and therefore a reliable point to finish harvesting tender crops.

Hard-frost dates—April 22 in spring and October 25 in fall—are noted because a frost at 28 °F can damage plants that survive a 32 °F light frost, making hard frost the more critical threshold.

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 2" 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 Waynesburg, PANumbered nearest stations: 1 — near Morgantown, WV — 22 mi; 2 — Uniontown, PA — 24 mi; 3 — Fairmont, WV — 30 mi; 4 — Moundsville, WV — 31 mi; 5 — near Wheeling, WV — 33 mi.PAOHMD25 mi · 40 km1. near Morgantown, WV — 22 mi12. Uniontown, PA — 24 mi23. Fairmont, WV — 30 mi34. Moundsville, WV — 31 mi45. near Wheeling, WV — 33 mi5
  1. near Morgantown, WV 22 mi (36 km)
  2. Uniontown, PA 24 mi (38 km)
  3. Fairmont, WV 30 mi (49 km)
  4. Moundsville, WV 31 mi (50 km)
  5. near Wheeling, WV 33 mi (53 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: 39.8986, -80.1656.