U.S. Frost Dates by Weather Station

NOAA station USC00367409 · Pennsylvania

Frost Dates for Renovo, PA

NOAA weather station Renovo (USC00367409), Pennsylvania · elevation 660 ft (201 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 2250% chance of a frost before it
  • Frost-free season173 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Renovo, PASpring: a frost after April 17 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 22 in half of the years, before November 4 in 9 years out of 10. Typical frost-free season: 173 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 30First frost ~Oct 22Frost season at Renovo, PASpring: a frost after April 17 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 22 in half of the years, before November 4 in 9 years out of 10. Typical frost-free season: 173 days.JFMAMJJASONDLast frost ~Apr 30First frost ~Oct 22
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 25 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 22
90% (likely)April 17November 4
Frost-free season (32°F, 50% chance)
173 days
Hard frost (28°F), last in spring, 50% chance after
April 18
Hard frost (28°F), first in fall, 50% chance before
November 2

The last 15 years (2006–2020 normals)

Typical last frost April 30 (same as the 30-year normal), typical first fall frost October 24 (2 days later). Frost-free season 176 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 Renovo: 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 3, 50% April 30, 60% April 27, 70% April 25, 80% April 21, 90% April 17. Observed last spring frost in recent years: 2021 April 27, 2022 May 1, 2023 May 18, 2024 April 27, 2025 April 18, 2026 May 12.Spring: last frostChance of a frost after this date10%50%90%May 1May 17Apr 30Apr 172021: April 272022: May 12023: May 182024: April 272025: April 182026: May 12Fall at Renovo: chance of a frost before this dateFall, chance of a frost before the date: 10% October 6, 20% October 10, 30% October 15, 40% October 19, 50% October 22, 60% October 25, 70% October 28, 80% November 1, 90% November 4. Observed first fall frost in recent years: 2021 November 4, 2022 October 18, 2023 October 23, 2024 October 25, 2025 October 10.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 6Oct 22Nov 42021: November 42022: October 182023: October 232024: October 252025: 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
2021April 27November 4
2022May 1October 18
2023May 18October 23
2024April 27October 25
2025April 18October 10
2026May 12season not over yet

What these dates mean

May 17 is the cautious spring date for Renovo; with only a 10% chance of a light frost later, it gives a gardener the confidence to set out tender crops. The comparable cautious fall date is October 6, when there is only a 10% chance that a light frost has already arrived, allowing the final harvest of tender crops to be scheduled.

The 50% date is April 30 for spring light frost and October 22 for fall light frost; on each of those days a gardener faces even odds of a frost occurring later in spring or earlier in fall. The median hard-frost dates are April 18 in spring and November 2 in fall. A hard frost at 28 °F can cause more severe damage to plant tissue than a light frost at 32 °F, so those dates are important reference points.

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 Renovo, PANumbered nearest stations: 1 — Stevenson Dam, PA — 15 mi; 2 — Lock Haven, PA — 21 mi; 3 — State College, PA — 38 mi; 4 — Williamsport, PA — 43 mi; 5 — Canton, PA — 51 mi.NY25 mi · 40 km1. Stevenson Dam, PA — 15 mi12. Lock Haven, PA — 21 mi23. State College, PA — 38 mi34. Williamsport, PA — 43 mi45. Canton, PA — 51 mi5
  1. Stevenson Dam, PA 15 mi (25 km)
  2. Lock Haven, PA 21 mi (34 km)
  3. State College, PA 38 mi (61 km)
  4. Williamsport, PA 43 mi (69 km)
  5. Canton, PA 51 mi (82 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: 41.33, -77.7381.