U.S. Frost Dates by Weather Station

NOAA station USC00457544 · Washington

Frost Dates for Sequim, WA

NOAA weather station Sequim 2 E (USC00457544), Washington · elevation 50 ft (15 m) · hardiness zone 8b*

  • Lower-risk planting dateafter May 7only 1 spring in 10 still has a frost later
  • Typical last frostApril 2150% chance of a frost after it
  • Typical first fall frostOctober 2050% chance of a frost before it
  • Frost-free season181 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Sequim, WASpring: a frost after April 3 in 9 years out of 10, after April 21 in half of the years, after May 7 in 1 year out of 10. Fall: the first frost comes before October 3 in 1 year out of 10, before October 20 in half of the years, before November 3 in 9 years out of 10. Typical frost-free season: 181 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 21First frost ~Oct 20Frost season at Sequim, WASpring: a frost after April 3 in 9 years out of 10, after April 21 in half of the years, after May 7 in 1 year out of 10. Fall: the first frost comes before October 3 in 1 year out of 10, before October 20 in half of the years, before November 3 in 9 years out of 10. Typical frost-free season: 181 days.JFMAMJJASONDLast frost ~Apr 21First frost ~Oct 20
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 7October 3
50% (typical)April 21October 20
90% (likely)April 3November 3
Frost-free season (32°F, 50% chance)
181 days
Hard frost (28°F), last in spring, 50% chance after
March 28
Hard frost (28°F), first in fall, 50% chance before
November 7

The last 15 years (2006–2020 normals)

Typical last frost April 22 (1 day later than the 30-year normal), typical first fall frost October 21 (1 day later). Frost-free season 182 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 Sequim: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 7, 20% May 1, 30% April 28, 40% April 24, 50% April 21, 60% April 16, 70% April 13, 80% April 9, 90% April 3. Observed last spring frost in recent years: 2021 April 12, 2024 April 18, 2025 March 22, 2026 April 9.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 7Apr 21Apr 32021: April 122024: April 182025: March 222026: April 9Fall at Sequim: chance of a frost before this dateFall, chance of a frost before the date: 10% October 3, 20% October 8, 30% October 13, 40% October 17, 50% October 20, 60% October 22, 70% October 25, 80% October 30, 90% November 3. Observed first fall frost in recent years: 2021 October 11, 2022 November 3, 2024 November 15, 2025 November 19.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 3Oct 20Nov 32021: October 112022: November 32024: November 152025: 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 12October 11
2022incomplete recordNovember 3
2023incomplete recordincomplete record
2024April 18November 15
2025March 22November 19
2026April 9season not over yet

What these dates mean

May 7 is the cautious spring light-frost date for Sequim; with only a 10 % chance of a frost later, a gardener can plan to set out tender crops on that day. The early spring gamble is April 3, which carries a 90 % chance of frost, while the median light-frost date, April 21, represents an even chance.

In fall the cautious light-frost date is October 3, when there is only a 10 % chance that a frost has arrived, allowing the final harvest of tender crops to be scheduled around that time. The median light-frost date, October 20, marks a 50 % chance of frost, and the hard-frost median dates are March 28 in spring and November 7 in fall, each indicating an even chance of a 28 °F frost. A hard frost matters more because temperatures of 28 °F can damage plant tissue that survives a light frost at 32 °F.

How to read the probabilities

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

  • Spring: "10% after May 7" 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 3" 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 Sequim, WANumbered nearest stations: 1 — Coupeville, WA — 19 mi; 2 — Everett, WA — 41 mi; 3 — near Kirkland, WA — 46 mi; 4 — Cushman Powerhouse #2, WA — 50 mi; 5 — near Bellingham, WA — 51 mi.25 mi · 40 km1. Coupeville, WA — 19 mi12. Everett, WA — 41 mi23. near Kirkland, WA — 46 mi34. Cushman Powerhouse #2, WA — 50 mi45. near Bellingham, WA — 51 mi5
  1. Coupeville, WA 19 mi (31 km)
  2. Everett, WA 41 mi (66 km)
  3. near Kirkland, WA 46 mi (75 km)
  4. Cushman Powerhouse #2, WA 50 mi (80 km)
  5. near Bellingham, WA 51 mi (81 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: 48.085, -123.0639.