U.S. Frost Dates by Weather Station

NOAA station USC00362470 · Pennsylvania

Frost Dates for Ebensburg, PA

NOAA weather station Ebensburg Sewage Plant (USC00362470), Pennsylvania · elevation 1940 ft (591 m) · hardiness zone 6a*

  • Lower-risk planting dateafter June 1only 1 spring in 10 still has a frost later
  • Typical last frostMay 1750% chance of a frost after it
  • Typical first fall frostOctober 250% chance of a frost before it
  • Frost-free season136 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Ebensburg, PASpring: a frost after April 30 in 9 years out of 10, after May 17 in half of the years, after June 1 in 1 year out of 10. Fall: the first frost comes before September 19 in 1 year out of 10, before October 2 in half of the years, before October 14 in 9 years out of 10. Typical frost-free season: 136 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 17First frost ~Oct 2Frost season at Ebensburg, PASpring: a frost after April 30 in 9 years out of 10, after May 17 in half of the years, after June 1 in 1 year out of 10. Fall: the first frost comes before September 19 in 1 year out of 10, before October 2 in half of the years, before October 14 in 9 years out of 10. Typical frost-free season: 136 days.JFMAMJJASONDLast frost ~May 17First frost ~Oct 2
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)June 1September 19
50% (typical)May 17October 2
90% (likely)April 30October 14
Frost-free season (32°F, 50% chance)
136 days
Hard frost (28°F), last in spring, 50% chance after
May 4
Hard frost (28°F), first in fall, 50% chance before
October 13

The last 15 years (2006–2020 normals)

Typical last frost May 12 (5 days earlier than the 30-year normal), typical first fall frost October 8 (6 days later). Frost-free season 146 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 Ebensburg: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 1, 20% May 28, 30% May 25, 40% May 20, 50% May 17, 60% May 14, 70% May 10, 80% May 5, 90% April 30. Observed last spring frost in recent years: 2021 May 16, 2022 May 10, 2023 May 18, 2024 April 28, 2025 June 2, 2026 May 7.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1Jun 1May 17Apr 302021: May 162022: May 102023: May 182024: April 282025: June 22026: May 7Fall at Ebensburg: chance of a frost before this dateFall, chance of a frost before the date: 10% September 19, 20% September 24, 30% September 27, 40% September 30, 50% October 2, 60% October 4, 70% October 6, 80% October 9, 90% October 14. Observed first fall frost in recent years: 2021 November 2, 2022 October 9, 2023 October 19, 2024 October 11, 2025 October 9.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Sep 19Oct 2Oct 142021: November 22022: October 92023: October 192024: October 112025: October 9
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 16November 2
2022May 10October 9
2023May 18October 19
2024April 28October 11
2025June 2October 9
2026May 7season not over yet

What these dates mean

June 1 is the cautious spring light-frost date in Ebensburg, carrying only a 10 % chance that a frost will occur later. This date lets a gardener plan to set out tender crops with minimal risk of a damaging frost.

The 50 % light-frost dates are May 17 in spring and October 2 in fall; on each of those days there is an even chance of a frost occurring later (spring) or earlier (fall). The cautious fall date is September 19, which has just a 10 % chance that a frost has already arrived, allowing the safe completion of tender-crop harvests. The median hard-frost dates, May 4 and October 13, indicate the points at which a 28 °F frost is equally likely to have happened.

Hard frosts at 28 °F matter more than light frosts at 32 °F because they can damage or kill plants that survive a milder freeze.

How to read the probabilities

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

  • Spring: "10% after June 1" 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 September 19" 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 Ebensburg, PANumbered nearest stations: 1 — Altoona, PA — 14 mi; 2 — near Patton, PA — 16 mi; 3 — Indiana, PA — 22 mi; 4 — near Martinsburg, PA — 25 mi; 5 — Everett, PA — 37 mi.MD25 mi · 40 km1. Altoona, PA — 14 mi12. near Patton, PA — 16 mi23. Indiana, PA — 22 mi34. near Martinsburg, PA — 25 mi45. Everett, PA — 37 mi5
  1. Altoona, PA 14 mi (23 km)
  2. near Patton, PA 16 mi (25 km)
  3. Indiana, PA 22 mi (36 km)
  4. near Martinsburg, PA 25 mi (40 km)
  5. Everett, PA 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: 40.4681, -78.7308.