Frost dates for 39365Union, MS
The average last spring frost in Union is March 20 and the average first fall frost is November 9, giving a typical growing season of about 235 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 20
- Average first fall frost
- Nov 9
- Growing season
- 235 days
Safer after Apr 9 (1-in-10 risk)
Possible by Oct 26 (1-in-10 risk)
First frost typically in 6 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) | Mar 15 · Apr 3 · Apr 21 | Oct 17 · Oct 30 · Nov 14 | 210 days | 100% |
| Frost / freeze (32°F) | Feb 28 · Mar 20 · Apr 9 | Oct 26 · Nov 9 · Nov 28 | 235 days | 100% |
| Hard freeze (28°F) | Feb 11 · Mar 4 · Mar 25 | Nov 3 · Nov 21 · Dec 14 | 263 days | 100% |
Planting calendar for Union
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 | Feb 17 – Apr 25 |
| Tomatoes | Transplant outdoors | Apr 5 – Jul 20 |
| Peppers | Start seeds indoors | Feb 17 – Mar 20 |
| Peppers | Transplant outdoors | Apr 19 – May 20 |
| Eggplant | Start seeds indoors | Mar 6 – Apr 4 |
| Eggplant | Transplant outdoors | Apr 19 – May 20 |
| Cucumbers | Sow outdoors | Apr 19 – Jul 30 |
| Summer squash | Sow outdoors | Apr 5 – May 20 |
| Winter squash & pumpkins | Sow outdoors | Apr 19 – May 20 |
| Snap beans | Sow outdoors | Apr 5 – Aug 22 |
| Sweet corn | Sow outdoors | Apr 5 – Jul 20 |
| Watermelon & cantaloupe | Sow outdoors | Apr 19 – May 20 |
| Okra | Sow outdoors | Apr 12 – May 5 |
| Peas | Sow outdoors (spring) | Feb 17 – Apr 4 |
| Potatoes | Plant outdoors (spring) | Feb 17 – Apr 19 |
| Onions | Start seeds indoors (spring) | Jan 6 – Feb 2 |
| Onions | Transplant outdoors (spring) | Mar 6 – Apr 4 |
| Broccoli | Start seeds indoors (spring) | Jan 30 – Mar 5 |
| Broccoli | Transplant outdoors (spring) | Mar 6 – Apr 4 |
| Broccoli | Start seeds indoors (fall) | Jul 10 – Jul 20 |
| Broccoli | Transplant outdoors (fall) | Aug 9 – Aug 20 |
| Cabbage | Start seeds indoors (spring) | Jan 20 – Feb 17 |
| Cabbage | Transplant outdoors (spring) | Feb 17 – Mar 20 |
| Cabbage | Start seeds indoors (fall) | Jun 30 – Jul 30 |
| Cabbage | Transplant outdoors (fall) | Jul 30 – Aug 30 |
| Leaf lettuce | Sow outdoors (spring) | Feb 17 – May 5 |
| Leaf lettuce | Sow outdoors (fall) | Jul 30 – Sep 15 |
| Spinach | Sow outdoors (spring) | Feb 10 – Mar 26 |
| Spinach | Sow outdoors (fall) | Aug 16 – Sep 20 |
| Radishes | Sow outdoors (spring) | Feb 17 – Apr 9 |
| Radishes | Sow outdoors (fall) | Jul 30 – Sep 30 |
| Kale | Sow outdoors (spring) | Mar 6 – Mar 26 |
| Kale | Sow outdoors (fall) | Jul 23 – Aug 30 |
| Carrots | Sow outdoors (spring) | Mar 20 – May 5 |
| Carrots | Sow outdoors (fall) | Jun 30 – Aug 15 |
| Garlic | Plant outdoors (fall) | Oct 30 – Nov 30 |
Where these dates come from
ZIP code 39365 is matched to the NOAA station Philadelphia 1 Wsw, MS, 14 km away, at 413 ft elevation (138 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Philadelphia 1 Wsw, MS (used) | 413 ft | Mar 20 | Nov 9 |
| Newton Exp Stn, MS | 349 ft | Mar 25 | Nov 2 |
| Newton 5 Ene, MS | 374 ft | Mar 24 | Nov 5 |
| Carthage, MS | 370 ft | Mar 19 | Nov 7 |
Frost dates near Union
- Philadelphia, MS 39350 · last Mar 20, first Nov 9
- Little Rock, MS 39337 · last Mar 24, first Nov 5
- Sebastopol, MS 39359 · last Mar 28, first Nov 2
- Decatur, MS 39327 · last Mar 24, first Nov 5
- Madden, MS 39109 · last Mar 19, first Nov 7
- Collinsville, MS 39325 · last Mar 24, first Nov 5
- Conehatta, MS 39057 · last Mar 28, first Nov 2
- Walnut Grove, MS 39189 · last Mar 19, first Nov 7
Frequently asked questions
- When is the last frost in Union, MS?
- For ZIP code 39365, the average last spring frost (32°F) is March 20, based on NOAA 1991-2020 climate normals for the Philadelphia 1 Wsw, MS weather station. There is a 1-in-10 chance of a frost after April 9.
- When is the first frost in Union, MS?
- The average first fall frost (32°F) is November 9. There is a 1-in-10 chance of frost by October 26, so tender plants are at risk from that point on.
- How long is the growing season in 39365?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 235 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.