U.S. Frost Dates by Weather Station

NOAA station USC00145063 · Kansas

Frost Dates for Marysville, KS

NOAA weather station Marysville (USC00145063), Kansas · elevation 1178 ft (359 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 9only 1 spring in 10 still has a frost later
  • Typical last frostApril 2550% chance of a frost after it
  • Typical first fall frostOctober 1350% chance of a frost before it
  • Frost-free season171 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Marysville, KSSpring: a frost after April 10 in 9 years out of 10, after April 25 in half of the years, after May 9 in 1 year out of 10. Fall: the first frost comes before September 28 in 1 year out of 10, before October 13 in half of the years, before October 26 in 9 years out of 10. Typical frost-free season: 171 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 25First frost ~Oct 13Frost season at Marysville, KSSpring: a frost after April 10 in 9 years out of 10, after April 25 in half of the years, after May 9 in 1 year out of 10. Fall: the first frost comes before September 28 in 1 year out of 10, before October 13 in half of the years, before October 26 in 9 years out of 10. Typical frost-free season: 171 days.JFMAMJJASONDLast frost ~Apr 25First frost ~Oct 13
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 9September 28
50% (typical)April 25October 13
90% (likely)April 10October 26
Frost-free season (32°F, 50% chance)
171 days
Hard frost (28°F), last in spring, 50% chance after
April 14
Hard frost (28°F), first in fall, 50% chance before
October 22

The last 15 years (2006–2020 normals)

Typical last frost April 23 (2 days earlier than the 30-year normal), typical first fall frost October 16 (3 days later). Frost-free season 174 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 Marysville: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 9, 20% May 3, 30% April 30, 40% April 28, 50% April 25, 60% April 21, 70% April 18, 80% April 15, 90% April 10. Observed last spring frost in recent years: 2022 May 26, 2023 May 2, 2025 April 10, 2026 May 1.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Jun 1May 9Apr 25Apr 102022: May 262023: May 22025: April 102026: May 1Fall at Marysville: chance of a frost before this dateFall, chance of a frost before the date: 10% September 28, 20% October 3, 30% October 7, 40% October 10, 50% October 13, 60% October 16, 70% October 19, 80% October 22, 90% October 26. Observed first fall frost in recent years: 2021 October 13, 2022 September 23, 2023 October 16, 2024 October 13, 2025 October 21.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Sep 28Oct 13Oct 262021: October 132022: September 232023: October 162024: October 132025: October 21
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
2021incomplete recordOctober 13
2022May 26September 23
2023May 2October 16
2024incomplete recordOctober 13
2025April 10October 21
2026May 1season not over yet

What these dates mean

The 171 days between the 50% dates in Marysville define the core frost-free window. The 50% spring light-frost date is April 25, meaning a light frost is equally likely to occur on either side of that date. The 50% fall light-frost date is October 13, meaning a light frost is equally likely to occur on either side of that date.

For a low-risk plan, tender crops should be set out after the cautious spring date of May 9, which carries only a 10 % chance of a later frost. In the autumn, the cautious date to finish harvesting tender crops is September 28, when there is only a 10 % chance that a frost has already arrived.

Hard frosts at 28 °F are more damaging than light frosts, and the median hard-frost dates are April 14 in spring and October 22 in fall.

How to read the probabilities

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

  • Spring: "10% after May 9" 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 28" 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 Marysville, KSNumbered nearest stations: 1 — Washington, KS — 22 mi; 2 — Fairbury, NE — 32 mi; 3 — near Manhattan, KS — 41 mi; 4 — Clay Center, KS — 41 mi; 5 — Tecumseh, NE — 43 mi.KSNEMO25 mi · 40 km1. Washington, KS — 22 mi12. Fairbury, NE — 32 mi23. near Manhattan, KS — 41 mi34. Clay Center, KS — 41 mi45. Tecumseh, NE — 43 mi5
  1. Washington, KS 22 mi (36 km)
  2. Fairbury, NE 32 mi (52 km)
  3. near Manhattan, KS 41 mi (66 km)
  4. Clay Center, KS 41 mi (67 km)
  5. Tecumseh, NE 43 mi (69 km)

Sources

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

Station coordinates: 39.8383, -96.6364.