Union, MS frost dates
Last spring frostMar 20median date
First fall frostNov 9median date
Growing season234 daysfrost-free
Hardiness zone8bZone 8b
How Union compares
- In 8 years out of 10, the last spring frost in Union falls between February 28 and April 9, a 40-day window. The first fall frost falls between October 26 and November 28.
- The median last frost is 3 days later than the Mississippi median of Mar 17.
- Its 234-day growing season is longer than 38% of the 435 Mississippi places with a regular frost season (state median 239 days).
- The last frost is 4 days later than the zone 8b median of Mar 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8b chart.
- The weather station records an average of 49 nights a year at or below 32°F.
- Compared with Jackson, MS, 107 km away, the last frost here is 14 days later than there and the growing season is 24 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 28 |
| 50% (median) | March 20 |
| 10% (safe for tender plants) | April 9 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 26 |
| 50% (median) | November 9 |
| 90% (late) | November 28 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Union, MS
Union, MS frost dates — last frost Mar 20, first frost Nov 9, zone 8b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 26 to Jan 9Start indoors: Dec 26 to Jan 9Transplant outside: Feb 20 to Mar 6
Start indoors: Jan 9 to Jan 23Transplant outside: Apr 3 to Apr 17
Start indoors: Jan 9 to Jan 23Transplant outside: Apr 3 to Apr 17
Start indoors: Jan 23 to Feb 6Transplant outside: Mar 27 to Apr 10
Start indoors: Jan 23 to Feb 6Transplant outside: Feb 27 to Mar 13Sow outdoors: Feb 20 to Mar 27Plant for fall: Sep 14 to Oct 12
Start indoors: Jan 23 to Feb 6Transplant outside: Feb 20 to Mar 6Sow outdoors: Feb 20 to Mar 6Plant for fall: Aug 31 to Sep 21
Start indoors: Jan 23 to Feb 6Transplant outside: Mar 6 to Mar 20Plant for fall: Aug 3 to Aug 24
Start indoors: Jan 23 to Feb 6Transplant outside: Feb 27 to Mar 13Plant for fall: Aug 3 to Aug 24
Start indoors: Jan 23 to Feb 6Transplant outside: Mar 6 to Mar 20Plant for fall: Aug 3 to Aug 24
Start indoors: Feb 6 to Feb 20Transplant outside: Apr 10 to Apr 24Sow outdoors: Apr 10 to Apr 24
Start indoors: Feb 6 to Feb 20Transplant outside: Mar 27 to Apr 10
Sow outdoors: Feb 6 to Feb 27Plant for fall: Aug 17 to Sep 7
Sow outdoors: Feb 6 to Feb 27Plant for fall: Sep 14 to Oct 5
Sow outdoors: Feb 13 to Mar 27Plant for fall: Sep 28 to Oct 19
Start indoors: Feb 20 to Feb 27Transplant outside: Apr 3 to Apr 10Sow outdoors: Mar 27 to Apr 10Plant for fall: Aug 24 to Sep 7
Start indoors: Feb 20 to Feb 27Sow outdoors: Mar 27 to Apr 10Plant for fall: Aug 31 to Sep 14
Start indoors: Feb 20 to Feb 27Sow outdoors: Mar 27 to Apr 10
Start indoors: Feb 20 to Feb 27Transplant outside: Apr 3 to Apr 17
Sow outdoors: Feb 27 to Mar 27Plant for fall: Aug 17 to Aug 31
Sow outdoors: Feb 27 to Mar 27Plant for fall: Aug 31 to Sep 14
Sow outdoors: Feb 27 to Mar 20
Sow outdoors: Mar 6 to Apr 3Plant for fall: Aug 31 to Sep 14
Sow outdoors: Mar 6 to Mar 27Plant for fall: Sep 14 to Oct 5
Sow outdoors: Mar 27 to Apr 17Plant for fall: Aug 24 to Sep 7
Sow outdoors: Mar 27 to Apr 10
Transplant outside: Apr 3 to Apr 24
Plant for fall: Oct 26 to Nov 30
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Union, MS
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 26 – Jan 9 | Feb 20 – Mar 6 | — | — |
| Peppers | Jan 9 – Jan 23 | Apr 3 – Apr 17 | — | — |
| Eggplant | Jan 9 – Jan 23 | Apr 3 – Apr 17 | — | — |
| Tomatoes | Jan 23 – Feb 6 | Mar 27 – Apr 10 | — | — |
| Lettuce | Jan 23 – Feb 6 | Feb 27 – Mar 13 | Feb 20 – Mar 27 | Sep 14 – Oct 12 |
| Kale | Jan 23 – Feb 6 | Feb 20 – Mar 6 | Feb 20 – Mar 6 | Aug 31 – Sep 21 |
| Broccoli | Jan 23 – Feb 6 | Mar 6 – Mar 20 | — | Aug 3 – Aug 24 |
| Cabbage | Jan 23 – Feb 6 | Feb 27 – Mar 13 | — | Aug 3 – Aug 24 |
| Cauliflower | Jan 23 – Feb 6 | Mar 6 – Mar 20 | — | Aug 3 – Aug 24 |
| Okra | Feb 6 – Feb 20 | Apr 10 – Apr 24 | Apr 10 – Apr 24 | — |
| Basil | Feb 6 – Feb 20 | Mar 27 – Apr 10 | — | — |
| Peas | — | — | Feb 6 – Feb 27 | Aug 17 – Sep 7 |
| Spinach | — | — | Feb 6 – Feb 27 | Sep 14 – Oct 5 |
| Radishes | — | — | Feb 13 – Mar 27 | Sep 28 – Oct 19 |
| Cucumbers | Feb 20 – Feb 27 | Apr 3 – Apr 10 | Mar 27 – Apr 10 | Aug 24 – Sep 7 |
| Zucchini & Summer Squash | Feb 20 – Feb 27 | — | Mar 27 – Apr 10 | Aug 31 – Sep 14 |
| Winter Squash & Pumpkins | Feb 20 – Feb 27 | — | Mar 27 – Apr 10 | — |
| Melons & Watermelon | Feb 20 – Feb 27 | Apr 3 – Apr 17 | — | — |
| Carrots | — | — | Feb 27 – Mar 27 | Aug 17 – Aug 31 |
| Beets | — | — | Feb 27 – Mar 27 | Aug 31 – Sep 14 |
| Potatoes | — | — | Feb 27 – Mar 20 | — |
| Swiss Chard | — | — | Mar 6 – Apr 3 | Aug 31 – Sep 14 |
| Cilantro | — | — | Mar 6 – Mar 27 | Sep 14 – Oct 5 |
| Green Beans | — | — | Mar 27 – Apr 17 | Aug 24 – Sep 7 |
| Sweet Corn | — | — | Mar 27 – Apr 10 | — |
| Sweet Potatoes | — | Apr 3 – Apr 24 | — | — |
| Garlic | — | — | — | Oct 26 – Nov 30 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Philadelphia 1 Wsw, MS weather station, 14 km away (elevation 413 ft (126 m)).
Frost dates near Union
- Philadelphia Mar 20 · Nov 9
- Little Rock Mar 24 · Nov 5
- Sebastopol Mar 28 · Nov 2
- Decatur Mar 25 · Nov 2
- Madden Mar 19 · Nov 7
- Collinsville Mar 16 · Nov 12
- Conehatta Mar 28 · Nov 2
- Walnut Grove Mar 19 · Nov 7
- Chunky Mar 24 · Nov 5
- Newton Mar 25 · Nov 2
Frequently asked questions
When is the last frost in Union, MS?
The median last spring frost in Union, MS is March 20. There is still about a 10% chance of frost after April 9, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Union, MS?
The median first fall frost is November 9, with about a 10% chance of frost before October 26.
How long is the growing season in Union, MS?
About 234 days between the median last spring frost and first fall frost.
What planting zone is Union, MS?
Union, MS is in USDA hardiness zone 8b.