U.S. Frost Dates by Weather Station

NOAA station USC00364778 · Pennsylvania

Frost Dates for Landisville, PA

NOAA weather station Landisville 2 NW (USC00364778), Pennsylvania · elevation 360 ft (110 m) · hardiness zone 7a*

  • Lower-risk planting dateafter May 13only 1 spring in 10 still has a frost later
  • Typical last frostApril 3050% chance of a frost after it
  • Typical first fall frostOctober 1050% chance of a frost before it
  • Frost-free season162 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Landisville, PASpring: a frost after April 16 in 9 years out of 10, after April 30 in half of the years, after May 13 in 1 year out of 10. Fall: the first frost comes before September 29 in 1 year out of 10, before October 10 in half of the years, before October 26 in 9 years out of 10. Typical frost-free season: 162 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 30First frost ~Oct 10Frost season at Landisville, PASpring: a frost after April 16 in 9 years out of 10, after April 30 in half of the years, after May 13 in 1 year out of 10. Fall: the first frost comes before September 29 in 1 year out of 10, before October 10 in half of the years, before October 26 in 9 years out of 10. Typical frost-free season: 162 days.JFMAMJJASONDLast frost ~Apr 30First 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 13September 29
50% (typical)April 30October 10
90% (likely)April 16October 26
Frost-free season (32°F, 50% chance)
162 days
Hard frost (28°F), last in spring, 50% chance after
April 18
Hard frost (28°F), first in fall, 50% chance before
October 24

The last 15 years (2006–2020 normals)

Typical last frost April 30 (same as the 30-year normal), typical first fall frost October 15 (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 Landisville: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 13, 20% May 8, 30% May 5, 40% May 2, 50% April 30, 60% April 28, 70% April 25, 80% April 21, 90% April 16. Observed last spring frost in recent years: 2023 April 19, 2024 March 26.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 13Apr 30Apr 162023: April 192024: March 26Fall at Landisville: chance of a frost before this dateFall, chance of a frost before the date: 10% September 29, 20% October 2, 30% October 5, 40% October 8, 50% October 10, 60% October 13, 70% October 16, 80% October 21, 90% October 26. Observed first fall frost in recent years: 2022 October 19, 2023 November 1, 2024 October 17.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Sep 29Oct 10Oct 262022: October 192023: November 12024: 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
2021incomplete recordincomplete record
2022incomplete recordOctober 19
2023April 19November 1
2024March 26October 17
2025incomplete recordno data
2026no dataseason not over yet

What these dates mean

May 13 is the cautious spring date in Landisville, and it allows a gardener to set out tender crops with only a 10% chance of a later frost. The 50% light-frost date is April 30, the point at which a gardener faces a 50% chance of a light frost. For hard frost, the 50% date is April 18, marking the middle of the record for a 28 °F frost.

September 29 is the cautious fall date to finish harvesting tender crops, carrying only a 10% chance that a frost has already arrived. The 50% light-frost date is October 10, and the hard-frost median is October 24. A hard frost at 28 °F can damage plants more severely than a light frost at 32 °F, so the hard-frost dates are important reference points for protecting sensitive crops.

How to read the probabilities

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

  • Spring: "10% after May 13" 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 29" 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 Landisville, PANumbered nearest stations: 1 — near Lancaster, PA — 9 mi; 2 — Lebanon, PA — 15 mi; 3 — near Middletown, PA — 19 mi; 4 — New Holland, PA — 19 mi; 5 — near Whitfield, PA — 28 mi.PADE25 mi · 40 km1. near Lancaster, PA — 9 mi12. Lebanon, PA — 15 mi23. near Middletown, PA — 19 mi34. New Holland, PA — 19 mi45. near Whitfield, PA — 28 mi5
  1. near Lancaster, PA 9 mi (15 km)
  2. Lebanon, PA 15 mi (24 km)
  3. near Middletown, PA 19 mi (30 km)
  4. New Holland, PA 19 mi (31 km)
  5. near Whitfield, PA 28 mi (45 km)

Sources

* Hardiness zone 7a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 40.1192, -76.4264.