When to plant in Eureka, MO
USDA Zone 6bEureka, Missouri frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Eureka's nearest full-normals station sits about 18 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. In zone 6b, Eureka gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
ST LOUIS SPRT OF S L AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Eureka’s own odds, recorded at ST LOUIS SPRT OF S L AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 7 | Apr 24 | Apr 10 | Sep 30 | Oct 14 | Oct 26 |
| 32°F | Apr 27 | Apr 12 | Mar 28 | Oct 11 | Oct 23 | Nov 5 |
| 28°F | Apr 17 | Mar 31 | Mar 14 | Oct 22 | Nov 3 | Nov 18 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Eureka, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 23 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Eureka planting FAQ
When is the last spring frost in Eureka, MO?
Plan for the last spring frost in Eureka around April 12 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Eureka, MO?
Expect Eureka's first fall frost near October 23 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Eureka in?
Eureka is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Eureka?
Eureka has about 194 frost-free days — a moderate growing season — between the average last spring frost (April 12) and first fall frost (October 23).
When should I plant tomatoes in Eureka?
For Eureka, sow tomatoes indoors about February 15–March 1 and move the seedlings out around April 19, after the last spring frost.
Never miss a window in Eureka
An email when it’s time to start seeds, transplant, and sow — timed to Eureka’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Wildwood · 9 km
- Ellisville · 11 km
- Ballwin · 14 km
- Manchester · 15 km
- Chesterfield · 19 km
- Town and Country · 21 km
- Kirkwood · 22 km
- Crestwood · 24 km
Frost dates recorded at ST LOUIS SPRT OF S L AP, 18 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Eureka, MO — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003966. Retrieved from https://blissgarden.com/missouri/eureka.