U.S. Frost Dates by Weather Station

NOAA station USC00365050 · Pennsylvania

Frost Dates for Linesville, PA

NOAA weather station Linesville 1 S (USC00365050), Pennsylvania · elevation 1030 ft (314 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 17only 1 spring in 10 still has a frost later
  • Typical last frostApril 3050% chance of a frost after it
  • Typical first fall frostOctober 2350% chance of a frost before it
  • Frost-free season177 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Linesville, PASpring: a frost after April 16 in 9 years out of 10, after April 30 in half of the years, after May 17 in 1 year out of 10. Fall: the first frost comes before October 6 in 1 year out of 10, before October 23 in half of the years, before November 6 in 9 years out of 10. Typical frost-free season: 177 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 30First frost ~Oct 23Frost season at Linesville, PASpring: a frost after April 16 in 9 years out of 10, after April 30 in half of the years, after May 17 in 1 year out of 10. Fall: the first frost comes before October 6 in 1 year out of 10, before October 23 in half of the years, before November 6 in 9 years out of 10. Typical frost-free season: 177 days.JFMAMJJASONDLast frost ~Apr 30First frost ~Oct 23
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 27 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 17October 6
50% (typical)April 30October 23
90% (likely)April 16November 6
Frost-free season (32°F, 50% chance)
177 days
Hard frost (28°F), last in spring, 50% chance after
April 18
Hard frost (28°F), first in fall, 50% chance before
November 5

The last 15 years (2006–2020 normals)

Typical last frost April 29 (1 day earlier than the 30-year normal), typical first fall frost October 25 (2 days later). Frost-free season 178 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 Linesville: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 17, 20% May 11, 30% May 6, 40% May 2, 50% April 30, 60% April 27, 70% April 24, 80% April 21, 90% April 16.Spring: last frostChance of a frost after this date10%50%90%May 1May 17Apr 30Apr 16Fall at Linesville: chance of a frost before this dateFall, chance of a frost before the date: 10% October 6, 20% October 12, 30% October 17, 40% October 20, 50% October 23, 60% October 27, 70% October 31, 80% November 2, 90% November 6.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 6Oct 23Nov 6
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.

What these dates mean

Planting tender crops on the early spring date of April 16 carries a 90 % chance of a frost occurring later, making it a gamble for Linesville gardeners. The cautious alternative is the later May 17 date, which only has a 10 % chance of a frost after it, while the fall counterpart is October 6, with a 10 % chance of a frost earlier.

The 50 % spring date, April 30, marks the point where a frost is equally likely to arrive later or not, and the 50 % fall date, October 23, marks the point where a frost is equally likely to have arrived earlier. These median dates give a simple reference for the balance of risk.

Hard frost dates—April 18 in spring and November 5 in fall—are noted because a temperature of 28 °F can damage plant tissue that would survive a light frost at 32 °F, so they matter more.

How to read the probabilities

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

  • Spring: "10% after May 17" 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 6" 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 Linesville, PANumbered nearest stations: 1 — Jamestown, PA — 10 mi; 2 — Dorset, OH — 13 mi; 3 — Youngstown, OH — 30 mi; 4 — Erie, PA — 32 mi; 5 — Franklin, PA — 35 mi.PAOHNY25 mi · 40 km1. Jamestown, PA — 10 mi12. Dorset, OH — 13 mi23. Youngstown, OH — 30 mi34. Erie, PA — 32 mi45. Franklin, PA — 35 mi5
  1. Jamestown, PA 10 mi (17 km)
  2. Dorset, OH 13 mi (21 km)
  3. Youngstown, OH 30 mi (48 km)
  4. Erie, PA 32 mi (52 km)
  5. Franklin, PA 35 mi (57 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: 41.6458, -80.425.