U.S. Frost Dates by Weather Station

NOAA station USC00051186 · Colorado

Frost Dates for Cabin Creek, CO

NOAA weather station Cabin Creek (USC00051186), Colorado · elevation 10020 ft (3054 m) · hardiness zone 5b*

  • Lower-risk planting dateafter June 21only 1 spring in 10 still has a frost later
  • Typical last frostJune 650% chance of a frost after it
  • Typical first fall frostSeptember 1950% chance of a frost before it
  • Frost-free season103 daystypical year, 32°F
  • Hardiness zone5bcalculated*

The year at a glance

Frost season at Cabin Creek, COSpring: a frost after May 25 in 9 years out of 10, after June 6 in half of the years, after June 21 in 1 year out of 10. Fall: the first frost comes before September 5 in 1 year out of 10, before September 19 in half of the years, before September 30 in 9 years out of 10. Typical frost-free season: 103 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Jun 6First frost ~Sep 19Frost season at Cabin Creek, COSpring: a frost after May 25 in 9 years out of 10, after June 6 in half of the years, after June 21 in 1 year out of 10. Fall: the first frost comes before September 5 in 1 year out of 10, before September 19 in half of the years, before September 30 in 9 years out of 10. Typical frost-free season: 103 days.JFMAMJJASONDLast frost ~Jun 6First frost ~Sep 19
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 26 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)June 21September 5
50% (typical)June 6September 19
90% (likely)May 25September 30
Frost-free season (32°F, 50% chance)
103 days
Hard frost (28°F), last in spring, 50% chance after
May 25
Hard frost (28°F), first in fall, 50% chance before
September 26

The last 15 years (2006–2020 normals)

Typical last frost June 2 (4 days earlier than the 30-year normal), typical first fall frost September 24 (5 days later). Frost-free season 111 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 Cabin Creek: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 21, 20% June 16, 30% June 13, 40% June 9, 50% June 6, 60% June 4, 70% June 1, 80% May 30, 90% May 25. Observed last spring frost in recent years: 2021 June 2, 2022 June 2, 2023 May 13, 2024 June 20, 2025 May 27, 2026 May 31.Spring: last frostChance of a frost after this date10%50%90%Jun 1Jul 1Jun 21Jun 6May 252021: June 22022: June 22023: May 132024: June 202025: May 272026: May 31Fall at Cabin Creek: chance of a frost before this dateFall, chance of a frost before the date: 10% September 5, 20% September 10, 30% September 13, 40% September 15, 50% September 19, 60% September 21, 70% September 23, 80% September 26, 90% September 30. Observed first fall frost in recent years: 2021 September 21, 2022 October 6, 2023 September 16, 2024 September 22, 2025 September 17.Fall: first frostChance of a frost before this date10%50%90%Sep 1Oct 1Sep 5Sep 19Sep 302021: September 212022: October 62023: September 162024: September 222025: September 17
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
2021June 2September 21
2022June 2October 6
2023May 13September 16
2024June 20September 22
2025May 27September 17
2026May 31season not over yet

What these dates mean

June 21 is the cautious spring date, the point at which only a 10 % chance remains for a light frost later, so a gardener can plan to set out tender crops. The 50% dates—June 6 for spring and September 19 for fall—mark the median moment when a 32 °F light frost is equally likely to occur later or earlier; they are not frost dates themselves.

September 5 is the cautious fall date, offering a 10 % chance that a light frost has arrived earlier, which guides the latest time to finish harvesting tender crops. The hard-frost 50% dates are May 25 in spring and September 26 in fall, and a hard frost at 28 °F can damage plants that survive a 32 °F light frost, making it a more serious threat.

How to read the probabilities

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

  • Spring: "10% after June 21" 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 5" 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 Cabin Creek, CONumbered nearest stations: 1 — Georgetown, CO — 3 mi; 2 — Grant, CO — 14 mi; 3 — Evergreen, CO — 21 mi; 4 — Bailey, CO — 21 mi; 5 — near Coal Creek, CO — 24 mi.25 mi · 40 km1. Georgetown, CO — 3 mi12. Grant, CO — 14 mi23. Evergreen, CO — 21 mi34. Bailey, CO — 21 mi45. near Coal Creek, CO — 24 mi5
  1. Georgetown, CO 3 mi (6 km)
  2. Grant, CO 14 mi (22 km)
  3. Evergreen, CO 21 mi (34 km)
  4. Bailey, CO 21 mi (34 km)
  5. near Coal Creek, CO 24 mi (39 km)

Sources

* Hardiness zone 5b: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 39.6553, -105.7089.