U.S. Frost Dates by Weather Station

NOAA station USC00140693 · Kansas

Frost Dates for Beloit, KS

NOAA weather station Beloit (USC00140693), Kansas · elevation 1391 ft (424 m) · hardiness zone 6b*

  • Lower-risk planting dateafter May 2only 1 spring in 10 still has a frost later
  • Typical last frostApril 1950% chance of a frost after it
  • Typical first fall frostOctober 1950% chance of a frost before it
  • Frost-free season181 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season at Beloit, KSSpring: a frost after April 5 in 9 years out of 10, after April 19 in half of the years, after May 2 in 1 year out of 10. Fall: the first frost comes before October 4 in 1 year out of 10, before October 19 in half of the years, before October 31 in 9 years out of 10. Typical frost-free season: 181 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 19First frost ~Oct 19Frost season at Beloit, KSSpring: a frost after April 5 in 9 years out of 10, after April 19 in half of the years, after May 2 in 1 year out of 10. Fall: the first frost comes before October 4 in 1 year out of 10, before October 19 in half of the years, before October 31 in 9 years out of 10. Typical frost-free season: 181 days.JFMAMJJASONDLast frost ~Apr 19First frost ~Oct 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)May 2October 4
50% (typical)April 19October 19
90% (likely)April 5October 31
Frost-free season (32°F, 50% chance)
181 days
Hard frost (28°F), last in spring, 50% chance after
April 8
Hard frost (28°F), first in fall, 50% chance before
October 27

The last 15 years (2006–2020 normals)

Typical last frost April 22 (3 days later than the 30-year normal), typical first fall frost October 19. Frost-free season 180 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 Beloit: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 2, 20% April 28, 30% April 24, 40% April 21, 50% April 19, 60% April 15, 70% April 12, 80% April 9, 90% April 5. Observed last spring frost in recent years: 2021 April 22, 2022 April 26, 2023 April 23, 2024 April 13, 2025 April 15, 2026 April 19.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 2Apr 19Apr 52021: April 222022: April 262023: April 232024: April 132025: April 152026: April 19Fall at Beloit: chance of a frost before this dateFall, chance of a frost before the date: 10% October 4, 20% October 11, 30% October 14, 40% October 16, 50% October 19, 60% October 21, 70% October 23, 80% October 26, 90% October 31. Observed first fall frost in recent years: 2021 October 30, 2022 October 17, 2023 October 16, 2024 October 16, 2025 October 30.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 4Oct 19Oct 312021: October 302022: October 172023: October 162024: October 162025: October 30
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 22October 30
2022April 26October 17
2023April 23October 16
2024April 13October 16
2025April 15October 30
2026April 19season not over yet

What these dates mean

The early spring date, April 5, is a gamble for setting out tender crops in Beloit, Kansas, because there is a 90 % chance of a frost later than this date. Gardeners seeking a more cautious approach can wait until the May 2 date, which carries only a 10 % chance of a frost later, before exposing tender plants to the outdoors.

The 50 % date for light frost in spring is April 19, meaning a gardener has an even chance of a frost occurring after that point; the fall counterpart is October 19. Hard-frost risk is marked by the 50 % dates of April 8 and October 27, and a hard frost at 28 °F matters more than a light frost at 32 °F because the lower temperature can kill tissue that would survive a light frost. The cautious fall date for finishing tender crops is October 4, which has only a 10 % chance of a frost earlier than that day.

How to read the probabilities

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

  • Spring: "10% after May 2" 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 4" 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 Beloit, KSNumbered nearest stations: 1 — Concordia, KS — 25 mi; 2 — Minneapolis, KS — 32 mi; 3 — Belleville, KS — 36 mi; 4 — Wilson Lake, KS — 39 mi; 5 — Superior, NE — 40 mi.25 mi · 40 km1. Concordia, KS — 25 mi12. Minneapolis, KS — 32 mi23. Belleville, KS — 36 mi34. Wilson Lake, KS — 39 mi45. Superior, NE — 40 mi5
  1. Concordia, KS 25 mi (41 km)
  2. Minneapolis, KS 32 mi (51 km)
  3. Belleville, KS 36 mi (57 km)
  4. Wilson Lake, KS 39 mi (63 km)
  5. Superior, NE 40 mi (64 km)

Sources

* Hardiness zone 6b: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 39.4575, -98.1125.