U.S. Frost Dates by Weather Station

NOAA station USC00328415 · North Dakota

Frost Dates for Streeter, ND

NOAA weather station Streeter 5 NW (USC00328415), North Dakota · elevation 1961 ft (598 m) · hardiness zone 4a*

  • Lower-risk planting dateafter May 27only 1 spring in 10 still has a frost later
  • Typical last frostMay 1350% chance of a frost after it
  • Typical first fall frostSeptember 3050% chance of a frost before it
  • Frost-free season139 daystypical year, 32°F
  • Hardiness zone4acalculated*

The year at a glance

Frost season at Streeter, NDSpring: a frost after May 2 in 9 years out of 10, after May 13 in half of the years, after May 27 in 1 year out of 10. Fall: the first frost comes before September 16 in 1 year out of 10, before September 30 in half of the years, before October 12 in 9 years out of 10. Typical frost-free season: 139 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 13First frost ~Sep 30Frost season at Streeter, NDSpring: a frost after May 2 in 9 years out of 10, after May 13 in half of the years, after May 27 in 1 year out of 10. Fall: the first frost comes before September 16 in 1 year out of 10, before September 30 in half of the years, before October 12 in 9 years out of 10. Typical frost-free season: 139 days.JFMAMJJASONDLast frost ~May 13First frost ~Sep 30
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 27September 16
50% (typical)May 13September 30
90% (likely)May 2October 12
Frost-free season (32°F, 50% chance)
139 days
Hard frost (28°F), last in spring, 50% chance after
May 4
Hard frost (28°F), first in fall, 50% chance before
October 7

The last 15 years (2006–2020 normals)

Typical last frost May 11 (2 days earlier than the 30-year normal), typical first fall frost October 4 (4 days later). Frost-free season 144 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 Streeter: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 27, 20% May 23, 30% May 19, 40% May 16, 50% May 13, 60% May 11, 70% May 8, 80% May 5, 90% May 2. Observed last spring frost in recent years: 2021 May 11, 2022 May 3, 2023 May 2, 2024 May 28, 2025 April 29.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1May 27May 13May 22021: May 112022: May 32023: May 22024: May 282025: April 29Fall at Streeter: chance of a frost before this dateFall, chance of a frost before the date: 10% September 16, 20% September 21, 30% September 25, 40% September 27, 50% September 30, 60% October 2, 70% October 4, 80% October 8, 90% October 12. Observed first fall frost in recent years: 2021 October 21, 2022 October 5, 2023 October 7, 2024 October 14, 2025 October 18.Fall: first frostChance of a frost before this date10%50%90%Oct 1Sep 16Sep 30Oct 122021: October 212022: October 52023: October 72024: October 142025: October 18
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
2021May 11October 21
2022May 3October 5
2023May 2October 7
2024May 28October 14
2025April 29October 18
2026incomplete recordseason not over yet

What these dates mean

The cautious fall date in Streeter for finishing the harvest is September 16, when there is only a 10 % chance that a light frost has arrived earlier.

For a gardener, the 50 % dates—May 13 in spring and September 30 in fall—mark the median point at which a light frost is equally likely to have occurred or not; they are not frost dates themselves. The cautious plan for tender crops uses the May 27 light-frost date, which carries a 10 % chance of a later frost, and the September 16 date, which carries a 10 % chance of an earlier frost. A hard frost at 28 °F, recorded by the median dates May 4 and October 7, can injure or kill plants that would otherwise survive a 32 °F light frost.

How to read the probabilities

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

  • Spring: "10% after May 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 September 16" 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 Streeter, NDNumbered nearest stations: 1 — Napoleon, ND — 21 mi; 2 — Steele, ND — 27 mi; 3 — Jamestown State Hosp, ND — 38 mi; 4 — Jamestown, ND — 40 mi; 5 — Hazelton, ND — 45 mi.25 mi · 40 km1. Napoleon, ND — 21 mi12. Steele, ND — 27 mi23. Jamestown State Hosp, ND — 38 mi34. Jamestown, ND — 40 mi45. Hazelton, ND — 45 mi5
  1. Napoleon, ND 21 mi (34 km)
  2. Steele, ND 27 mi (43 km)
  3. Jamestown State Hosp, ND 38 mi (61 km)
  4. Jamestown, ND 40 mi (64 km)
  5. Hazelton, ND 45 mi (72 km)

Sources

* Hardiness zone 4a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 46.7153, -99.4475.