Frost dates for 63167 — Saint Louis, MO
How Saint Louis compares
- In 8 years out of 10, the last spring frost in Saint Louis falls between March 20 and April 21, a 32-day window. The first fall frost falls between October 15 and November 11.
- The median last frost is 8 days earlier than the Missouri median of Apr 12.
- Its 208-day growing season is longer than 86% of the 938 Missouri places with a regular frost season (state median 195 days).
- The last frost is 12 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 106 nights a year at or below 32°F.
- Compared with Florissant, MO, 17 km away, the last frost here is 2 days later than there and the growing season is 8 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 20 |
| 50% (median) | April 4 |
| 10% (safe for tender plants) | April 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 15 |
| 50% (median) | October 29 |
| 90% (late) | November 11 |
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 Saint Louis, MO
Frost dates for 63167 — Saint Louis, MO — last frost Apr 4, first frost Oct 29, zone 7a. whenisthelastfrost.com
When to plant vegetables in Saint Louis, MO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 10 – Jan 24 | Mar 7 – Mar 21 | — | — |
| Peppers | Jan 24 – Feb 7 | Apr 18 – May 2 | — | — |
| Eggplant | Jan 24 – Feb 7 | Apr 18 – May 2 | — | — |
| Tomatoes | Feb 7 – Feb 21 | Apr 11 – Apr 25 | — | — |
| Lettuce | Feb 7 – Feb 21 | Mar 14 – Mar 28 | Mar 7 – Apr 11 | Sep 3 – Oct 1 |
| Kale | Feb 7 – Feb 21 | Mar 7 – Mar 21 | Mar 7 – Mar 21 | Aug 20 – Sep 10 |
| Broccoli | Feb 7 – Feb 21 | Mar 21 – Apr 4 | — | Jul 23 – Aug 13 |
| Cabbage | Feb 7 – Feb 21 | Mar 14 – Mar 28 | — | Jul 23 – Aug 13 |
| Cauliflower | Feb 7 – Feb 21 | Mar 21 – Apr 4 | — | Jul 23 – Aug 13 |
| Okra | Feb 21 – Mar 7 | Apr 25 – May 9 | Apr 25 – May 9 | — |
| Basil | Feb 21 – Mar 7 | Apr 11 – Apr 25 | — | — |
| Peas | — | — | Feb 21 – Mar 14 | Aug 6 – Aug 27 |
| Spinach | — | — | Feb 21 – Mar 14 | Sep 3 – Sep 24 |
| Radishes | — | — | Feb 28 – Apr 11 | Sep 17 – Oct 8 |
| Cucumbers | Mar 7 – Mar 14 | Apr 18 – Apr 25 | Apr 11 – Apr 25 | Aug 13 – Aug 27 |
| Zucchini & Summer Squash | Mar 7 – Mar 14 | — | Apr 11 – Apr 25 | Aug 20 – Sep 3 |
| Winter Squash & Pumpkins | Mar 7 – Mar 14 | — | Apr 11 – Apr 25 | — |
| Melons & Watermelon | Mar 7 – Mar 14 | Apr 18 – May 2 | — | — |
| Carrots | — | — | Mar 14 – Apr 11 | Aug 6 – Aug 20 |
| Beets | — | — | Mar 14 – Apr 11 | Aug 20 – Sep 3 |
| Potatoes | — | — | Mar 14 – Apr 4 | — |
| Swiss Chard | — | — | Mar 21 – Apr 18 | Aug 20 – Sep 3 |
| Cilantro | — | — | Mar 21 – Apr 11 | Sep 3 – Sep 24 |
| Green Beans | — | — | Apr 11 – May 2 | Aug 13 – Aug 27 |
| Sweet Corn | — | — | Apr 11 – Apr 25 | — |
| Sweet Potatoes | — | Apr 18 – May 9 | — | — |
| Garlic | — | — | — | Oct 15 – Nov 19 |
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 St Charles 7 Ssw, MO weather station, 10 km away (elevation 449 ft (137 m)).
ZIP codes in Saint Louis: 63101 63102 63103 63104 63105 63106 63107 63108 63109 63110 63111 63112 63113 63114 63115 63116 63117 63118 63119 63120 63121 63122 63123 63124 63125 63126 63127 63128 63129 63130 63131 63132 63133 63134 63135 63136 63137 63138 63139 63140 63141 63143 63144 63145 63146 63147 63150 63151 63155 63156 63157 63158 63160 63163 63164 63166 63167 63169 63171 63177 …
Frost dates near Saint Louis
- Fenton Apr 4 · Oct 29
- Maryland Heights Apr 2 · Nov 4
- Saint Ann Apr 2 · Nov 4
- Valley Park Apr 4 · Oct 29
- Ballwin Apr 4 · Oct 29
- Bridgeton Apr 2 · Nov 4
- Chesterfield Apr 4 · Oct 29
- Earth City Apr 8 · Oct 29
Frequently asked questions
When is the last frost in Saint Louis, MO?
The median last spring frost in Saint Louis, MO is April 4. There is still about a 10% chance of frost after April 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Saint Louis, MO?
The median first fall frost is October 29, with about a 10% chance of frost before October 15.
How long is the growing season in Saint Louis, MO?
About 208 days between the median last spring frost and first fall frost.
What planting zone is Saint Louis, MO?
Saint Louis, MO is in USDA hardiness zone 7a.