Frost dates for 47283Westport, IN
The average last spring frost in Westport is April 21 and the average first fall frost is October 21, giving a typical growing season of about 180 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 21
- Average first fall frost
- Oct 21
- Growing season
- 180 days
Safer after May 10 (1-in-10 risk)
Possible by Oct 7 (1-in-10 risk)
Last frost typically in 170 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 16 · May 2 · May 19 | Sep 29 · Oct 10 · Oct 22 | 161 days | 100% |
| Frost / freeze (32°F) | Apr 6 · Apr 21 · May 10 | Oct 7 · Oct 21 · Nov 1 | 180 days | 100% |
| Hard freeze (28°F) | Mar 23 · Apr 8 · Apr 28 | Oct 17 · Oct 31 · Nov 12 | 203 days | 100% |
Planting calendar for Westport
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 21 – May 27 |
| Tomatoes | Transplant outdoors | May 7 – Jul 1 |
| Peppers | Start seeds indoors | Mar 21 – Apr 21 |
| Peppers | Transplant outdoors | May 21 – Jun 21 |
| Eggplant | Start seeds indoors | Apr 7 – May 6 |
| Eggplant | Transplant outdoors | May 21 – Jun 21 |
| Cucumbers | Sow outdoors | May 21 – Jul 11 |
| Summer squash | Sow outdoors | May 7 – Jun 21 |
| Winter squash & pumpkins | Sow outdoors | May 21 – Jun 21 |
| Snap beans | Sow outdoors | May 7 – Aug 3 |
| Sweet corn | Sow outdoors | May 7 – Jul 1 |
| Watermelon & cantaloupe | Sow outdoors | May 21 – Jun 21 |
| Okra | Sow outdoors | May 14 – Jun 6 |
| Peas | Sow outdoors (spring) | Mar 21 – May 6 |
| Potatoes | Plant outdoors (spring) | Mar 21 – May 21 |
| Onions | Start seeds indoors (spring) | Feb 7 – Mar 6 |
| Onions | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (spring) | Mar 3 – Apr 6 |
| Broccoli | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (fall) | Jun 21 – Jul 1 |
| Broccoli | Transplant outdoors (fall) | Jul 21 – Aug 1 |
| Cabbage | Start seeds indoors (spring) | Feb 21 – Mar 21 |
| Cabbage | Transplant outdoors (spring) | Mar 21 – Apr 21 |
| Cabbage | Start seeds indoors (fall) | Jun 11 – Jul 11 |
| Cabbage | Transplant outdoors (fall) | Jul 11 – Aug 11 |
| Leaf lettuce | Sow outdoors (spring) | Mar 21 – Jun 6 |
| Leaf lettuce | Sow outdoors (fall) | Jul 11 – Aug 27 |
| Spinach | Sow outdoors (spring) | Mar 14 – Apr 27 |
| Spinach | Sow outdoors (fall) | Jul 28 – Sep 1 |
| Radishes | Sow outdoors (spring) | Mar 21 – May 11 |
| Radishes | Sow outdoors (fall) | Jul 11 – Sep 11 |
| Kale | Sow outdoors (spring) | Apr 7 – Apr 27 |
| Kale | Sow outdoors (fall) | Jul 4 – Aug 11 |
| Carrots | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Carrots | Sow outdoors (fall) | Jun 11 – Jul 27 |
| Garlic | Plant outdoors (fall) | Oct 11 – Nov 11 |
Where these dates come from
ZIP code 47283 is matched to the NOAA station N Vernon 2 Ese, IN, 19.3 km away, at 743 ft elevation (67 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| N Vernon 2 Ese, IN (used) | 743 ft | Apr 21 | Oct 21 |
| Greensburg, IN | 937 ft | Apr 15 | Oct 26 |
| Columbus, IN | 609 ft | Apr 11 | Oct 25 |
| Seymour 2 N, IN | 570 ft | Apr 16 | Oct 21 |
Frost dates near Westport
- Grammer, IN 47236 · last Apr 21, first Oct 21
- Hartsville, IN 47244 · last Apr 15, first Oct 26
- Millhousen, IN 47261 · last Apr 15, first Oct 26
- Greensburg, IN 47240 · last Apr 15, first Oct 26
- Scipio, IN 47273 · last Apr 21, first Oct 21
- Butlerville, IN 47223 · last Apr 21, first Oct 21
- North Vernon, IN 47265 · last Apr 21, first Oct 21
- Elizabethtown, IN 47232 · last Apr 11, first Oct 25
Frequently asked questions
- When is the last frost in Westport, IN?
- For ZIP code 47283, the average last spring frost (32°F) is April 21, based on NOAA 1991-2020 climate normals for the N Vernon 2 Ese, IN weather station. There is a 1-in-10 chance of a frost after May 10.
- When is the first frost in Westport, IN?
- The average first fall frost (32°F) is October 21. There is a 1-in-10 chance of frost by October 7, so tender plants are at risk from that point on.
- How long is the growing season in 47283?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 180 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.