Frost dates for 63025Eureka, MO
The average last spring frost in Eureka is April 12 and the average first fall frost is October 23, giving a typical growing season of about 193 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 12
- Average first fall frost
- Oct 23
- Growing season
- 193 days
Safer after Apr 27 (1-in-10 risk)
Possible by Oct 11 (1-in-10 risk)
Last frost typically in 162 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 10 · Apr 24 · May 7 | Sep 30 · Oct 14 · Oct 26 | 171 days | 100% |
| Frost / freeze (32°F) | Mar 28 · Apr 12 · Apr 27 | Oct 11 · Oct 23 · Nov 5 | 193 days | 100% |
| Hard freeze (28°F) | Mar 14 · Mar 31 · Apr 17 | Oct 22 · Nov 3 · Nov 18 | 216 days | 100% |
Planting calendar for Eureka
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 12 – May 18 |
| Tomatoes | Transplant outdoors | Apr 28 – Jul 3 |
| Peppers | Start seeds indoors | Mar 12 – Apr 12 |
| Peppers | Transplant outdoors | May 12 – Jun 12 |
| Eggplant | Start seeds indoors | Mar 29 – Apr 27 |
| Eggplant | Transplant outdoors | May 12 – Jun 12 |
| Cucumbers | Sow outdoors | May 12 – Jul 13 |
| Summer squash | Sow outdoors | Apr 28 – Jun 12 |
| Winter squash & pumpkins | Sow outdoors | May 12 – Jun 12 |
| Snap beans | Sow outdoors | Apr 28 – Aug 5 |
| Sweet corn | Sow outdoors | Apr 28 – Jul 3 |
| Watermelon & cantaloupe | Sow outdoors | May 12 – Jun 12 |
| Okra | Sow outdoors | May 5 – May 28 |
| Peas | Sow outdoors (spring) | Mar 12 – Apr 27 |
| Potatoes | Plant outdoors (spring) | Mar 12 – May 12 |
| Onions | Start seeds indoors (spring) | Jan 29 – Feb 25 |
| Onions | Transplant outdoors (spring) | Mar 29 – Apr 27 |
| Broccoli | Start seeds indoors (spring) | Feb 22 – Mar 28 |
| Broccoli | Transplant outdoors (spring) | Mar 29 – Apr 27 |
| Broccoli | Start seeds indoors (fall) | Jun 23 – Jul 3 |
| Broccoli | Transplant outdoors (fall) | Jul 23 – Aug 3 |
| Cabbage | Start seeds indoors (spring) | Feb 12 – Mar 12 |
| Cabbage | Transplant outdoors (spring) | Mar 12 – Apr 12 |
| Cabbage | Start seeds indoors (fall) | Jun 13 – Jul 13 |
| Cabbage | Transplant outdoors (fall) | Jul 13 – Aug 13 |
| Leaf lettuce | Sow outdoors (spring) | Mar 12 – May 28 |
| Leaf lettuce | Sow outdoors (fall) | Jul 13 – Aug 29 |
| Spinach | Sow outdoors (spring) | Mar 5 – Apr 18 |
| Spinach | Sow outdoors (fall) | Jul 30 – Sep 3 |
| Radishes | Sow outdoors (spring) | Mar 12 – May 2 |
| Radishes | Sow outdoors (fall) | Jul 13 – Sep 13 |
| Kale | Sow outdoors (spring) | Mar 29 – Apr 18 |
| Kale | Sow outdoors (fall) | Jul 6 – Aug 13 |
| Carrots | Sow outdoors (spring) | Apr 12 – May 28 |
| Carrots | Sow outdoors (fall) | Jun 13 – Jul 29 |
| Garlic | Plant outdoors (fall) | Oct 13 – Nov 13 |
Where these dates come from
ZIP code 63025 is matched to the NOAA station St Louis Sprt Of S L Ap, MO, 16.2 km away, at 462 ft elevation (83 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| St Louis Sprt Of S L Ap, MO (used) | 462 ft | Apr 12 | Oct 23 |
| Weldon Spring Nws, MO | 610 ft | Apr 10 | Oct 26 |
| St Charles 7 Ssw, MO | 450 ft | Apr 4 | Oct 29 |
| St Peters 2 Se, MO | 575 ft | Apr 9 | Oct 26 |
Frost dates near Eureka
- Grover, MO 63040 · last Apr 10, first Oct 26
- Glencoe, MO 63038 · last Apr 10, first Oct 26
- High Ridge, MO 63049 · last Apr 10, first Oct 26
- Pacific, MO 63069 · last Apr 10, first Oct 26
- Ballwin, MO 63021 · last Apr 4, first Oct 29
- House Springs, MO 63051 · last Apr 9, first Oct 26
- Valley Park, MO 63088 · last Apr 4, first Oct 29
- Chesterfield, MO 63005 · last Apr 10, first Oct 26
Frequently asked questions
- When is the last frost in Eureka, MO?
- For ZIP code 63025, the average last spring frost (32°F) is April 12, based on NOAA 1991-2020 climate normals for the St Louis Sprt Of S L Ap, MO weather station. There is a 1-in-10 chance of a frost after April 27.
- When is the first frost in Eureka, MO?
- The average first fall frost (32°F) is October 23. There is a 1-in-10 chance of frost by October 11, so tender plants are at risk from that point on.
- How long is the growing season in 63025?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 193 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.