Frost dates for 39521 — Bay Saint Louis, MS
Last spring frostMar 6median date
First fall frostNov 19median date
Growing season258 daysfrost-free
Hardiness zone9aZone 9a
How Bay Saint Louis compares
- In 8 years out of 10, the last spring frost in Bay Saint Louis falls between February 5 and March 27, a 50-day window. The first fall frost falls between November 3 and December 13.
- The median last frost is 11 days earlier than the Mississippi median of Mar 17.
- Its 258-day growing season is longer than 88% of the 435 Mississippi places with a regular frost season (state median 239 days).
- The last frost is typical for zone 9a, where the median is Mar 3.
- The weather station records an average of 31 nights a year at or below 32°F.
- Compared with Gulfport, MS, 41 km away, the last frost here is 11 days later than there and the growing season is 25 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 5 |
| 50% (median) | March 6 |
| 10% (safe for tender plants) | March 27 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 3 |
| 50% (median) | November 19 |
| 90% (late) | December 13 |
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 Bay Saint Louis, MS
Frost dates for 39521 — Bay Saint Louis, MS — last frost Mar 6, first frost Nov 19, zone 9a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 12 to Dec 26Transplant outside: Feb 6 to Feb 20
Start indoors: Dec 26 to Jan 9Start indoors: Dec 26 to Jan 9Transplant outside: Mar 20 to Apr 3
Start indoors: Dec 26 to Jan 9Start indoors: Dec 26 to Jan 9Transplant outside: Mar 20 to Apr 3
Start indoors: Jan 9 to Jan 23Transplant outside: Mar 13 to Mar 27
Start indoors: Jan 9 to Jan 23Transplant outside: Feb 13 to Feb 27Sow outdoors: Feb 6 to Mar 13Plant for fall: Sep 24 to Oct 22
Start indoors: Jan 9 to Jan 23Transplant outside: Feb 6 to Feb 20Sow outdoors: Feb 6 to Feb 20Plant for fall: Sep 10 to Oct 1
Start indoors: Jan 9 to Jan 23Transplant outside: Feb 20 to Mar 6Plant for fall: Aug 13 to Sep 3
Start indoors: Jan 9 to Jan 23Transplant outside: Feb 13 to Feb 27Plant for fall: Aug 13 to Sep 3
Start indoors: Jan 9 to Jan 23Transplant outside: Feb 20 to Mar 6Plant for fall: Aug 13 to Sep 3
Start indoors: Jan 23 to Feb 6Transplant outside: Mar 27 to Apr 10Sow outdoors: Mar 27 to Apr 10
Start indoors: Jan 23 to Feb 6Transplant outside: Mar 13 to Mar 27
Sow outdoors: Jan 23 to Feb 13Plant for fall: Aug 27 to Sep 17
Sow outdoors: Jan 23 to Feb 13Plant for fall: Sep 24 to Oct 15
Sow outdoors: Jan 30 to Mar 13Plant for fall: Oct 8 to Oct 29
Start indoors: Feb 6 to Feb 13Transplant outside: Mar 20 to Mar 27Sow outdoors: Mar 13 to Mar 27Plant for fall: Sep 3 to Sep 17
Start indoors: Feb 6 to Feb 13Sow outdoors: Mar 13 to Mar 27Plant for fall: Sep 10 to Sep 24
Start indoors: Feb 6 to Feb 13Sow outdoors: Mar 13 to Mar 27
Start indoors: Feb 6 to Feb 13Transplant outside: Mar 20 to Apr 3
Sow outdoors: Feb 13 to Mar 13Plant for fall: Aug 27 to Sep 10
Sow outdoors: Feb 13 to Mar 13Plant for fall: Sep 10 to Sep 24
Sow outdoors: Feb 13 to Mar 6
Sow outdoors: Feb 20 to Mar 20Plant for fall: Sep 10 to Sep 24
Sow outdoors: Feb 20 to Mar 13Plant for fall: Sep 24 to Oct 15
Sow outdoors: Mar 13 to Apr 3Plant for fall: Sep 3 to Sep 17
Sow outdoors: Mar 13 to Mar 27
Transplant outside: Mar 20 to Apr 10
Plant for fall: Nov 5 to Dec 10
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Bay Saint Louis, MS
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 12 – Dec 26 | Feb 6 – Feb 20 | — | — |
| Peppers | Dec 26 – Jan 9 | Mar 20 – Apr 3 | — | — |
| Eggplant | Dec 26 – Jan 9 | Mar 20 – Apr 3 | — | — |
| Tomatoes | Jan 9 – Jan 23 | Mar 13 – Mar 27 | — | — |
| Lettuce | Jan 9 – Jan 23 | Feb 13 – Feb 27 | Feb 6 – Mar 13 | Sep 24 – Oct 22 |
| Kale | Jan 9 – Jan 23 | Feb 6 – Feb 20 | Feb 6 – Feb 20 | Sep 10 – Oct 1 |
| Broccoli | Jan 9 – Jan 23 | Feb 20 – Mar 6 | — | Aug 13 – Sep 3 |
| Cabbage | Jan 9 – Jan 23 | Feb 13 – Feb 27 | — | Aug 13 – Sep 3 |
| Cauliflower | Jan 9 – Jan 23 | Feb 20 – Mar 6 | — | Aug 13 – Sep 3 |
| Okra | Jan 23 – Feb 6 | Mar 27 – Apr 10 | Mar 27 – Apr 10 | — |
| Basil | Jan 23 – Feb 6 | Mar 13 – Mar 27 | — | — |
| Peas | — | — | Jan 23 – Feb 13 | Aug 27 – Sep 17 |
| Spinach | — | — | Jan 23 – Feb 13 | Sep 24 – Oct 15 |
| Radishes | — | — | Jan 30 – Mar 13 | Oct 8 – Oct 29 |
| Cucumbers | Feb 6 – Feb 13 | Mar 20 – Mar 27 | Mar 13 – Mar 27 | Sep 3 – Sep 17 |
| Zucchini & Summer Squash | Feb 6 – Feb 13 | — | Mar 13 – Mar 27 | Sep 10 – Sep 24 |
| Winter Squash & Pumpkins | Feb 6 – Feb 13 | — | Mar 13 – Mar 27 | — |
| Melons & Watermelon | Feb 6 – Feb 13 | Mar 20 – Apr 3 | — | — |
| Carrots | — | — | Feb 13 – Mar 13 | Aug 27 – Sep 10 |
| Beets | — | — | Feb 13 – Mar 13 | Sep 10 – Sep 24 |
| Potatoes | — | — | Feb 13 – Mar 6 | — |
| Swiss Chard | — | — | Feb 20 – Mar 20 | Sep 10 – Sep 24 |
| Cilantro | — | — | Feb 20 – Mar 13 | Sep 24 – Oct 15 |
| Green Beans | — | — | Mar 13 – Apr 3 | Sep 3 – Sep 17 |
| Sweet Corn | — | — | Mar 13 – Mar 27 | — |
| Sweet Potatoes | — | Mar 20 – Apr 10 | — | — |
| Garlic | — | — | — | Nov 5 – Dec 10 |
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 Bay St Louis Nasa, MS weather station, 10 km away (elevation 30 ft (9 m)).
ZIP codes in Bay Saint Louis: 39520 39521
Frost dates near Bay Saint Louis
- Stennis Space Center Mar 6 · Nov 19
- Diamondhead Feb 21 · Dec 3
- Kiln Mar 6 · Nov 19
- Waveland Feb 21 · Dec 3
- Lakeshore Feb 21 · Dec 3
- Nicholson Mar 9 · Nov 18
- Pearlington Mar 6 · Nov 19
- Pass Christian Feb 21 · Dec 3
Frequently asked questions
When is the last frost in Bay Saint Louis, MS?
The median last spring frost in Bay Saint Louis, MS is March 6. There is still about a 10% chance of frost after March 27, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Bay Saint Louis, MS?
The median first fall frost is November 19, with about a 10% chance of frost before November 3.
How long is the growing season in Bay Saint Louis, MS?
About 258 days between the median last spring frost and first fall frost.
What planting zone is Bay Saint Louis, MS?
Bay Saint Louis, MS is in USDA hardiness zone 9a.