U.S. Frost Dates by Weather Station

NOAA station USC00147305 · Kansas

Frost Dates for Sedan, KS

NOAA weather station Sedan (USC00147305), Kansas · elevation 902 ft (275 m) · hardiness zone 7a*

  • Lower-risk planting dateafter April 27only 1 spring in 10 still has a frost later
  • Typical last frostApril 950% chance of a frost after it
  • Typical first fall frostOctober 2750% chance of a frost before it
  • Frost-free season199 daystypical year, 32°F
  • Hardiness zone7acalculated*

The year at a glance

Frost season at Sedan, KSSpring: a frost after March 24 in 9 years out of 10, after April 9 in half of the years, after April 27 in 1 year out of 10. Fall: the first frost comes before October 12 in 1 year out of 10, before October 27 in half of the years, before November 9 in 9 years out of 10. Typical frost-free season: 199 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 9First frost ~Oct 27Frost season at Sedan, KSSpring: a frost after March 24 in 9 years out of 10, after April 9 in half of the years, after April 27 in 1 year out of 10. Fall: the first frost comes before October 12 in 1 year out of 10, before October 27 in half of the years, before November 9 in 9 years out of 10. Typical frost-free season: 199 days.JFMAMJJASONDLast frost ~Apr 9First frost ~Oct 27
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)April 27October 12
50% (typical)April 9October 27
90% (likely)March 24November 9
Frost-free season (32°F, 50% chance)
199 days
Hard frost (28°F), last in spring, 50% chance after
March 29
Hard frost (28°F), first in fall, 50% chance before
November 4

The last 15 years (2006–2020 normals)

Typical last frost April 9 (same as the 30-year normal), typical first fall frost October 25 (2 days earlier). Frost-free season 199 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 Sedan: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 27, 20% April 21, 30% April 17, 40% April 13, 50% April 9, 60% April 6, 70% April 1, 80% March 30, 90% March 24. Observed last spring frost in recent years: 2021 April 22, 2022 April 19, 2023 April 24, 2024 March 29, 2025 April 8, 2026 March 18.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 27Apr 9Mar 242021: April 222022: April 192023: April 242024: March 292025: April 82026: March 18Fall at Sedan: chance of a frost before this dateFall, chance of a frost before the date: 10% October 12, 20% October 17, 30% October 21, 40% October 24, 50% October 27, 60% October 29, 70% November 1, 80% November 4, 90% November 9. Observed first fall frost in recent years: 2021 November 13, 2022 October 18, 2023 October 30, 2024 October 16, 2025 November 2.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 12Oct 27Nov 92021: November 132022: October 182023: October 302024: October 162025: November 2
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 22November 13
2022April 19October 18
2023April 24October 30
2024March 29October 16
2025April 8November 2
2026March 18season not over yet

What these dates mean

The 199 days between the 50% dates in Sedan—April 9 and October 27—enclose the period during which a light frost (32 °F) is less likely than not. Within this span a gardener can plan activities around the dates that carry only a 10 % chance of a frost, using them as the cautious benchmarks for tender crops.

The 50% date of April 9 means there is an even chance of a light frost occurring after that day in spring, while the 50% date of October 27 means there is an even chance of a light frost occurring before that day in fall; these dates are not themselves frost dates. For a cautious plan the spring date to set out tender crops is April 27, and the fall date to finish harvesting them is October 12. A hard frost at 28 °F matters more than a light frost at 32 °F because plants that can survive the milder temperature are often damaged or killed by the colder one.

How to read the probabilities

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

  • Spring: "10% after April 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 October 12" 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 Sedan, KSNumbered nearest stations: 1 — Howard, KS — 24 mi; 2 — near Bartlesville, OK — 27 mi; 3 — Independence, KS — 27 mi; 4 — Mound Valley, KS — 40 mi; 5 — Winfield, KS — 43 mi.KSOK25 mi · 40 km1. Howard, KS — 24 mi12. near Bartlesville, OK — 27 mi23. Independence, KS — 27 mi34. Mound Valley, KS — 40 mi45. Winfield, KS — 43 mi5
  1. Howard, KS 24 mi (38 km)
  2. near Bartlesville, OK 27 mi (43 km)
  3. Independence, KS 27 mi (44 km)
  4. Mound Valley, KS 40 mi (65 km)
  5. Winfield, KS 43 mi (70 km)

Sources

* Hardiness zone 7a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 37.1322, -96.18.