U.S. Frost Dates by Weather Station

NOAA station USC00351836 · Oregon

Frost Dates near Coquille, OR

NOAA weather station Coquille City (USC00351836), Oregon · elevation 23 ft (7 m) · hardiness zone 9a*

Coquille is the nearest town to the station (1.1 mi away) in GeoNames (CC BY 4.0). The dates below are measured at the station, not in the town itself.

  • Lower-risk planting dateafter April 27only 1 spring in 10 still has a frost later
  • Typical last frostMarch 2850% chance of a frost after it
  • Typical first fall frostNovember 650% chance of a frost before it
  • Frost-free season225 daystypical year, 32°F
  • Hardiness zone9acalculated*

The year at a glance

Frost season near Coquille, ORSpring: a frost after February 22 in 9 years out of 10, after March 28 in half of the years, after April 27 in 1 year out of 10. Fall: the first frost comes before October 17 in 1 year out of 10, before November 6 in half of the years, before December 6 in 9 years out of 10. Typical frost-free season: 225 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 28First frost ~Nov 6Frost season near Coquille, ORSpring: a frost after February 22 in 9 years out of 10, after March 28 in half of the years, after April 27 in 1 year out of 10. Fall: the first frost comes before October 17 in 1 year out of 10, before November 6 in half of the years, before December 6 in 9 years out of 10. Typical frost-free season: 225 days.JFMAMJJASONDLast frost ~Mar 28First frost ~Nov 6
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 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)April 27October 17
50% (typical)March 28November 6
90% (likely)February 22December 6
Frost-free season (32°F, 50% chance)
225 days
Hard frost (28°F), last in spring, 50% chance after
February 16
Hard frost (28°F), first in fall, 50% chance before
December 2

The last 15 years (2006–2020 normals)

Typical last frost March 31 (3 days later than the 30-year normal), typical first fall frost November 14 (8 days later). Frost-free season 228 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 near Coquille: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 27, 20% April 16, 30% April 9, 40% April 1, 50% March 28, 60% March 22, 70% March 14, 80% March 2, 90% February 22. Observed last spring frost in recent years: 2021 April 13, 2022 April 16, 2023 April 18, 2024 March 15, 2025 February 13, 2026 March 27.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1May 1Apr 27Mar 28Feb 222021: April 132022: April 162023: April 182024: March 152025: February 132026: March 27Fall near Coquille: chance of a frost before this dateFall, chance of a frost before the date: 10% October 17, 20% October 25, 30% October 29, 40% November 1, 50% November 6, 60% November 12, 70% November 19, 80% November 26, 90% December 6. Observed first fall frost in recent years: 2021 November 17, 2022 November 10, 2023 October 28, 2024 November 28, 2025 November 19.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 17Nov 6Dec 62021: November 172022: November 102023: October 282024: November 282025: November 19
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 13November 17
2022April 16November 10
2023April 18October 28
2024March 15November 28
2025February 13November 19
2026March 27season not over yet

What these dates mean

The cautious fall date to finish harvesting tender crops in the Coquille area is October 17, when there is only a 10% chance that a light frost has arrived earlier. In spring, the cautious date for setting out tender crops is April 27, which carries a 10% chance of a frost later than that day. The 50% light-frost dates—March 28 in spring and November 6 in fall—mark the points where a gardener faces an even chance of a frost later (spring) or earlier (fall). The median hard-frost dates are February 16 and December 2.

A hard frost at 28 °F is more damaging than a light frost at 32 °F because the colder temperature can injure plant tissue that survives a light frost. Planting on February 22 in spring or keeping tender crops until December 6 in fall involves a 90% chance of a frost and is therefore a gamble.

How to read the probabilities

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

  • Spring: "10% after April 27" 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 17" 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 Coquille, ORNumbered nearest stations: 1 — near Roseburg, OR — 42 mi; 2 — Riddle, OR — 46 mi; 3 — Drain, OR — 55 mi; 4 — Sexton Summit, OR — 59 mi; 5 — Cottage Grove, OR — 72 mi.OR25 mi · 40 km1. near Roseburg, OR — 42 mi12. Riddle, OR — 46 mi23. Drain, OR — 55 mi34. Sexton Summit, OR — 59 mi45. Cottage Grove, OR — 72 mi5
  1. near Roseburg, OR 42 mi (68 km)
  2. Riddle, OR 46 mi (74 km)
  3. Drain, OR 55 mi (88 km)
  4. Sexton Summit, OR 59 mi (94 km)
  5. Cottage Grove, OR 72 mi (116 km)

Sources

* Hardiness zone 9a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 43.1872, -124.2025.