Frost dates for St Louis Lambert Intl Ap, Missouri
Half of years have their last spring frost by April 2 — but 1 year in 10 still frosts after April 17.
Every other site gives you one date. A frost date is not a date: it is a percentile from 30 years of records at a nearby weather station, and planting to the median means losing the crop in half of years. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
- Frost this late in 1 year in 10
- April 17
- 1 year in 5
- April 11
- 3 years in 10
- April 7
- 2 years in 5
- April 5
- Half of years (the median)
- April 2
First fall freeze
- Freeze this early in 1 year in 10
- October 23
- 1 year in 5
- October 27
- 3 years in 10
- October 30
- 2 years in 5
- November 1
- Half of years (the median)
- November 4
- Growing season
- about 215 days
- Hardiness zones nearby
- 6b, 7a
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, station St Louis Lambert Intl Ap (USW00013994), at 38.75, -90.37. These are that station's own records, unshifted. The further your garden is from it, the less exactly they describe your ground — the planner resolves the nearest station to your own ZIP and lowers its confidence with distance, rather than presenting one number as if it were measured in your yard.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a hundred metres away does not. No table can know that about your garden. Your own logged frosts eventually can.
ZIP codes nearest this station
62018, 62024, 62040, 62048, 62059, 62060, 62084, 62087, 62090, 62095, 62201, 62206, 63026, 63031, 63033, 63034, 63042, 63043, 63044, 63045, 63074, 63101, 63102, 63103, 63104, 63105, 63106, 63107, 63108, 63109, 63110, 63111, 63112, 63113, 63114, 63115, 63116, 63117, 63118, 63119, 63120, 63121, 63122, 63123, 63124, 63125, 63126, 63127, 63130, 63131, 63132, 63133, 63134, 63135, 63136, 63137, 63138, 63139, 63140, 63141, 63143, 63144, 63146, 63147, 63155, 63301, 63386.
What can I plant here, and when? →
Nearby stations
The nearest stations, and how their last-frost dates compare — the frost gradient across your area, which no single station shows.
- Weldon Spring Nws, MO — last frost by April 10
- Belleville Siu Rsch, IL — last frost by April 12
- Festus, MO — last frost by April 9
- Carlinville Hcn, IL — last frost by April 14
- Ramsey, IL — last frost by April 15
- Springfield #2, IL — last frost by April 15
Other stations in Missouri.
- Pleasant Hill Wfo, MO — last frost by April 8
- Kansas City Intl Ap, MO — last frost by April 13