Frost dates for 50210New Virginia, IA
The average last spring frost in New Virginia is April 29 and the average first fall frost is October 9, giving a typical growing season of about 162 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 29
- Average first fall frost
- Oct 9
- Growing season
- 162 days
Safer after May 11 (1-in-10 risk)
Possible by Sep 24 (1-in-10 risk)
Last frost typically in 184 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 24 · May 7 · May 20 | Sep 15 · Sep 29 · Oct 13 | 144 days | 100% |
| Frost / freeze (32°F) | Apr 13 · Apr 29 · May 11 | Sep 24 · Oct 9 · Oct 24 | 162 days | 100% |
| Hard freeze (28°F) | Apr 2 · Apr 18 · May 2 | Oct 2 · Oct 20 · Nov 2 | 182 days | 100% |
Planting calendar for New Virginia
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 29 – Jun 4 |
| Tomatoes | Transplant outdoors | May 15 – Jun 19 |
| Peppers | Start seeds indoors | Mar 29 – Apr 29 |
| Peppers | Transplant outdoors | May 29 – Jun 29 |
| Eggplant | Start seeds indoors | Apr 15 – May 14 |
| Eggplant | Transplant outdoors | May 29 – Jun 29 |
| Cucumbers | Sow outdoors | May 29 – Jun 29 |
| Summer squash | Sow outdoors | May 15 – Jun 29 |
| Winter squash & pumpkins | Sow outdoors | May 29 – Jun 29 |
| Snap beans | Sow outdoors | May 15 – Jul 22 |
| Sweet corn | Sow outdoors | May 15 – Jun 19 |
| Watermelon & cantaloupe | Sow outdoors | May 29 – Jun 29 |
| Okra | Sow outdoors | May 22 – Jun 14 |
| Peas | Sow outdoors (spring) | Mar 29 – May 14 |
| Potatoes | Plant outdoors (spring) | Mar 29 – May 29 |
| Onions | Start seeds indoors (spring) | Feb 15 – Mar 14 |
| Onions | Transplant outdoors (spring) | Apr 15 – May 14 |
| Broccoli | Start seeds indoors (spring) | Mar 11 – Apr 14 |
| Broccoli | Transplant outdoors (spring) | Apr 15 – May 14 |
| Broccoli | Start seeds indoors (fall) | Jun 9 – Jun 19 |
| Broccoli | Transplant outdoors (fall) | Jul 9 – Jul 20 |
| Cabbage | Start seeds indoors (spring) | Mar 1 – Mar 29 |
| Cabbage | Transplant outdoors (spring) | Mar 29 – Apr 29 |
| Cabbage | Start seeds indoors (fall) | May 30 – Jun 29 |
| Cabbage | Transplant outdoors (fall) | Jun 29 – Jul 30 |
| Leaf lettuce | Sow outdoors (spring) | Mar 29 – Jun 14 |
| Leaf lettuce | Sow outdoors (fall) | Jun 29 – Aug 15 |
| Spinach | Sow outdoors (spring) | Mar 22 – May 5 |
| Spinach | Sow outdoors (fall) | Jul 16 – Aug 20 |
| Radishes | Sow outdoors (spring) | Mar 29 – May 19 |
| Radishes | Sow outdoors (fall) | Jun 29 – Aug 30 |
| Kale | Sow outdoors (spring) | Apr 15 – May 5 |
| Kale | Sow outdoors (fall) | Jun 22 – Jul 30 |
| Carrots | Sow outdoors (spring) | Apr 29 – Jun 14 |
| Carrots | Sow outdoors (fall) | May 30 – Jul 15 |
| Garlic | Plant outdoors (fall) | Sep 29 – Oct 30 |
Where these dates come from
ZIP code 50210 is matched to the NOAA station Osceola, IA, 19.3 km away, at 1,028 ft elevation (11 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Osceola, IA (used) | 1,028 ft | Apr 29 | Oct 9 |
| Indianola 2W, IA | 924 ft | Apr 24 | Oct 12 |
| Winterset 1S, IA | 1,100 ft | Apr 30 | Oct 3 |
| Des Moines Intl Ap, IA | 957 ft | Apr 18 | Oct 20 |
Frost dates near New Virginia
- Truro, IA 50257 · last Apr 30, first Oct 3
- Saint Marys, IA 50241 · last Apr 24, first Oct 12
- Saint Charles, IA 50240 · last Apr 30, first Oct 3
- Liberty Center, IA 50145 · last Apr 24, first Oct 12
- Indianola, IA 50125 · last Apr 24, first Oct 12
- Osceola, IA 50213 · last Apr 29, first Oct 9
- Martensdale, IA 50160 · last Apr 24, first Oct 12
- Peru, IA 50222 · last Apr 30, first Oct 3
Frequently asked questions
- When is the last frost in New Virginia, IA?
- For ZIP code 50210, the average last spring frost (32°F) is April 29, based on NOAA 1991-2020 climate normals for the Osceola, IA weather station. There is a 1-in-10 chance of a frost after May 11.
- When is the first frost in New Virginia, IA?
- The average first fall frost (32°F) is October 9. There is a 1-in-10 chance of frost by September 24, so tender plants are at risk from that point on.
- How long is the growing season in 50210?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 162 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.