U.S. Frost Dates by Weather Station

NOAA station USC00352112 · Oregon

Frost Dates for Dallas, OR

NOAA weather station Dallas 2 NE (USC00352112), Oregon · elevation 290 ft (88 m) · hardiness zone 8b*

  • Lower-risk planting dateafter May 5only 1 spring in 10 still has a frost later
  • Typical last frostApril 1650% chance of a frost after it
  • Typical first fall frostNovember 150% chance of a frost before it
  • Frost-free season199 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Dallas, ORSpring: a frost after March 21 in 9 years out of 10, after April 16 in half of the years, after May 5 in 1 year out of 10. Fall: the first frost comes before October 13 in 1 year out of 10, before November 1 in half of the years, before November 22 in 9 years out of 10. Typical frost-free season: 199 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 16First frost ~Nov 1Frost season at Dallas, ORSpring: a frost after March 21 in 9 years out of 10, after April 16 in half of the years, after May 5 in 1 year out of 10. Fall: the first frost comes before October 13 in 1 year out of 10, before November 1 in half of the years, before November 22 in 9 years out of 10. Typical frost-free season: 199 days.JFMAMJJASONDLast frost ~Apr 16First frost ~Nov 1
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 5October 13
50% (typical)April 16November 1
90% (likely)March 21November 22
Frost-free season (32°F, 50% chance)
199 days
Hard frost (28°F), last in spring, 50% chance after
March 7
Hard frost (28°F), first in fall, 50% chance before
November 20

The last 15 years (2006–2020 normals)

Typical last frost April 15 (1 day earlier than the 30-year normal), typical first fall frost November 3 (2 days later). Frost-free season 201 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 Dallas: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 5, 20% April 29, 30% April 25, 40% April 20, 50% April 16, 60% April 10, 70% April 4, 80% March 30, 90% March 21. Observed last spring frost in recent years: 2021 April 11, 2022 April 17, 2023 April 14, 2024 April 24, 2025 March 7, 2026 April 17.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1May 1May 5Apr 16Mar 212021: April 112022: April 172023: April 142024: April 242025: March 72026: April 17Fall at Dallas: chance of a frost before this dateFall, chance of a frost before the date: 10% October 13, 20% October 21, 30% October 25, 40% October 28, 50% November 1, 60% November 5, 70% November 9, 80% November 14, 90% November 22. Observed first fall frost in recent years: 2021 October 12, 2022 November 9, 2023 October 30, 2025 November 19.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Dec 1Oct 13Nov 1Nov 222021: October 122022: November 92023: October 302025: 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 11October 12
2022April 17November 9
2023April 14October 30
2024April 24incomplete record
2025March 7November 19
2026April 17season not over yet

What these dates mean

Planting tender crops on March 21 in Dallas carries a 90% chance of a frost later, so it is a gamble for a gardener.

The cautious spring date for setting out tender crops is May 5, when only a 10% chance of a later frost remains. In the fall the equally cautious point is October 13, with a 10% chance that a frost has arrived earlier. The 50% dates—April 16 in spring and November 1 in fall—represent the median point where the odds of a light frost are even; they are not themselves frost dates. The hard-frost 50% dates are March 7 and November 20.

A hard frost at 28 °F matters more than a light frost at 32 °F because it can injure or kill plants that would survive the milder temperature.

How to read the probabilities

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

  • Spring: "10% after May 5" 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 13" 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 Dallas, ORNumbered nearest stations: 1 — near Corvallis, OR — 22 mi; 2 — Silverton, OR — 26 mi; 3 — Stayton, OR — 26 mi; 4 — Otis, OR — 31 mi; 5 — Lacomb, OR — 36 mi.OR25 mi · 40 km1. near Corvallis, OR — 22 mi12. Silverton, OR — 26 mi23. Stayton, OR — 26 mi34. Otis, OR — 31 mi45. Lacomb, OR — 36 mi5
  1. near Corvallis, OR 22 mi (36 km)
  2. Silverton, OR 26 mi (41 km)
  3. Stayton, OR 26 mi (41 km)
  4. Otis, OR 31 mi (51 km)
  5. Lacomb, OR 36 mi (58 km)

Sources

* Hardiness zone 8b: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 44.9464, -123.2911.