U.S. Frost Dates by Weather Station

NOAA station USC00368888 · Pennsylvania

Frost Dates for Titusville, PA

NOAA weather station Titusville Water Works (USC00368888), Pennsylvania · elevation 1220 ft (372 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 28only 1 spring in 10 still has a frost later
  • Typical last frostMay 1250% chance of a frost after it
  • Typical first fall frostOctober 1050% chance of a frost before it
  • Frost-free season149 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Titusville, PASpring: a frost after April 29 in 9 years out of 10, after May 12 in half of the years, after May 28 in 1 year out of 10. Fall: the first frost comes before September 25 in 1 year out of 10, before October 10 in half of the years, before October 23 in 9 years out of 10. Typical frost-free season: 149 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 12First frost ~Oct 10Frost season at Titusville, PASpring: a frost after April 29 in 9 years out of 10, after May 12 in half of the years, after May 28 in 1 year out of 10. Fall: the first frost comes before September 25 in 1 year out of 10, before October 10 in half of the years, before October 23 in 9 years out of 10. Typical frost-free season: 149 days.JFMAMJJASONDLast frost ~May 12First frost ~Oct 10
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 28September 25
50% (typical)May 12October 10
90% (likely)April 29October 23
Frost-free season (32°F, 50% chance)
149 days
Hard frost (28°F), last in spring, 50% chance after
May 1
Hard frost (28°F), first in fall, 50% chance before
October 21

The last 15 years (2006–2020 normals)

Typical last frost May 9 (3 days earlier than the 30-year normal), typical first fall frost October 15 (5 days later). Frost-free season 156 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 Titusville: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 28, 20% May 23, 30% May 19, 40% May 16, 50% May 12, 60% May 9, 70% May 6, 80% May 2, 90% April 29. Observed last spring frost in recent years: 2021 May 15, 2022 May 1, 2023 May 26, 2024 April 27, 2025 June 2, 2026 May 13.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1May 28May 12Apr 292021: May 152022: May 12023: May 262024: April 272025: June 22026: May 13Fall at Titusville: chance of a frost before this dateFall, chance of a frost before the date: 10% September 25, 20% October 1, 30% October 3, 40% October 6, 50% October 10, 60% October 12, 70% October 15, 80% October 18, 90% October 23. Observed first fall frost in recent years: 2021 November 2, 2022 October 16, 2023 October 23, 2024 October 11, 2025 October 10.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Sep 25Oct 10Oct 232021: November 22022: October 162023: October 232024: October 112025: October 10
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 15November 2
2022May 1October 16
2023May 26October 23
2024April 27October 11
2025June 2October 10
2026May 13season not over yet

What these dates mean

The 149 days between the 50% dates in Titusville house the core season for planting, maturing, and harvesting tender crops. The 50% date of May 12 marks the point where a light frost has an even chance of occurring later in spring, while the 50% date of October 10 marks the point where a light frost has an even chance of arriving earlier in fall.

The cautious spring date for setting out tender crops is May 28, which carries only a 10% chance of a later frost; planting on April 29 would be a gamble with a 90% chance of frost afterward. In fall, the cautious date to finish harvesting tender crops is September 25, which carries only a 10% chance that a frost has arrived earlier; waiting until October 23 would be a gamble with a 90% chance of an earlier frost.

Hard frost at 28 °F, marked by the median dates of May 1 and October 21, can damage plants more severely than a light frost at 32 °F.

How to read the probabilities

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

  • Spring: "10% after May 28" 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 25" 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 Titusville, PANumbered nearest stations: 1 — Franklin, PA — 17 mi; 2 — Warren, PA — 32 mi; 3 — Linesville, PA — 38 mi; 4 — Erie, PA — 40 mi; 5 — Jamestown, PA — 41 mi.NYOH25 mi · 40 km1. Franklin, PA — 17 mi12. Warren, PA — 32 mi23. Linesville, PA — 38 mi34. Erie, PA — 40 mi45. Jamestown, PA — 41 mi5
  1. Franklin, PA 17 mi (28 km)
  2. Warren, PA 32 mi (51 km)
  3. Linesville, PA 38 mi (61 km)
  4. Erie, PA 40 mi (64 km)
  5. Jamestown, PA 41 mi (66 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: 41.6308, -79.6931.