Frost dates for 63166 — Saint Louis, MO
How Saint Louis compares
- In 8 years out of 10, the last spring frost in Saint Louis falls between March 14 and April 18, a 35-day window. The first fall frost falls between October 24 and November 21.
- The median last frost is 11 days earlier than the Missouri median of Apr 12.
- Its 217-day growing season is longer than 94% of the 938 Missouri places with a regular frost season (state median 195 days).
- The last frost is 15 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 79 nights a year at or below 32°F.
- Compared with Florissant, MO, 15 km away, the last frost here is 1 day earlier than there and the growing season is 1 day longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 14 |
| 50% (median) | April 1 |
| 10% (safe for tender plants) | April 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 24 |
| 50% (median) | November 4 |
| 90% (late) | November 21 |
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 63166 — Saint Louis, MO — last frost Apr 1, first frost Nov 4, zone 7a. whenisthelastfrost.com
When to plant vegetables in Saint Louis, MO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 7 – Jan 21 | Mar 4 – Mar 18 | — | — |
| Peppers | Jan 21 – Feb 4 | Apr 15 – Apr 29 | — | — |
| Eggplant | Jan 21 – Feb 4 | Apr 15 – Apr 29 | — | — |
| Tomatoes | Feb 4 – Feb 18 | Apr 8 – Apr 22 | — | — |
| Lettuce | Feb 4 – Feb 18 | Mar 11 – Mar 25 | Mar 4 – Apr 8 | Sep 9 – Oct 7 |
| Kale | Feb 4 – Feb 18 | Mar 4 – Mar 18 | Mar 4 – Mar 18 | Aug 26 – Sep 16 |
| Broccoli | Feb 4 – Feb 18 | Mar 18 – Apr 1 | — | Jul 29 – Aug 19 |
| Cabbage | Feb 4 – Feb 18 | Mar 11 – Mar 25 | — | Jul 29 – Aug 19 |
| Cauliflower | Feb 4 – Feb 18 | Mar 18 – Apr 1 | — | Jul 29 – Aug 19 |
| Okra | Feb 18 – Mar 4 | Apr 22 – May 6 | Apr 22 – May 6 | — |
| Basil | Feb 18 – Mar 4 | Apr 8 – Apr 22 | — | — |
| Peas | — | — | Feb 18 – Mar 11 | Aug 12 – Sep 2 |
| Spinach | — | — | Feb 18 – Mar 11 | Sep 9 – Sep 30 |
| Radishes | — | — | Feb 25 – Apr 8 | Sep 23 – Oct 14 |
| Cucumbers | Mar 4 – Mar 11 | Apr 15 – Apr 22 | Apr 8 – Apr 22 | Aug 19 – Sep 2 |
| Zucchini & Summer Squash | Mar 4 – Mar 11 | — | Apr 8 – Apr 22 | Aug 26 – Sep 9 |
| Winter Squash & Pumpkins | Mar 4 – Mar 11 | — | Apr 8 – Apr 22 | — |
| Melons & Watermelon | Mar 4 – Mar 11 | Apr 15 – Apr 29 | — | — |
| Carrots | — | — | Mar 11 – Apr 8 | Aug 12 – Aug 26 |
| Beets | — | — | Mar 11 – Apr 8 | Aug 26 – Sep 9 |
| Potatoes | — | — | Mar 11 – Apr 1 | — |
| Swiss Chard | — | — | Mar 18 – Apr 15 | Aug 26 – Sep 9 |
| Cilantro | — | — | Mar 18 – Apr 8 | Sep 9 – Sep 30 |
| Green Beans | — | — | Apr 8 – Apr 29 | Aug 19 – Sep 2 |
| Sweet Corn | — | — | Apr 8 – Apr 22 | — |
| Sweet Potatoes | — | Apr 15 – May 6 | — | — |
| Garlic | — | — | — | Oct 21 – Nov 25 |
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 Louis Sci Ctr, MO weather station, 3 km away (elevation 515 ft (157 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
- Saint Ann Apr 2 · Nov 4
- Florissant Apr 2 · Nov 4
- Hazelwood Apr 2 · Nov 4
- Bridgeton Apr 2 · Nov 4
- Maryland Heights Apr 2 · Nov 4
- Fenton Apr 4 · Oct 29
- Earth City Apr 8 · Oct 29
- Valley Park Apr 4 · 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 1. There is still about a 10% chance of frost after April 18, 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 November 4, with about a 10% chance of frost before October 24.
How long is the growing season in Saint Louis, MO?
About 217 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.