Sumner, MO frost dates
Last spring frostApr 14median date
First fall frostOct 23median date
Growing season192 daysfrost-free
Hardiness zone6aZone 6a
How Sumner compares
- In 8 years out of 10, the last spring frost in Sumner falls between March 31 and April 28, a 28-day window. The first fall frost falls between October 9 and November 3.
- The median last frost is 2 days later than the Missouri median of Apr 12.
- Its 192-day growing season is longer than 37% of the 938 Missouri places with a regular frost season (state median 195 days).
- The last frost is 15 days earlier than the zone 6a median of Apr 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6a chart.
- The weather station records an average of 121 nights a year at or below 32°F.
- Compared with Columbia, MO, 109 km away, the last frost here is 9 days later than there and the growing season is 17 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 31 |
| 50% (median) | April 14 |
| 10% (safe for tender plants) | April 28 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 9 |
| 50% (median) | October 23 |
| 90% (late) | November 3 |
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 Sumner, MO
Sumner, MO frost dates — last frost Apr 14, first frost Oct 23, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Jan 20 to Feb 3Transplant outside: Mar 17 to Mar 31
Start indoors: Feb 3 to Feb 17Transplant outside: Apr 28 to May 12
Start indoors: Feb 3 to Feb 17Transplant outside: Apr 28 to May 12
Start indoors: Feb 17 to Mar 3Transplant outside: Apr 21 to May 5
Start indoors: Feb 17 to Mar 3Transplant outside: Mar 24 to Apr 7Sow outdoors: Mar 17 to Apr 21Plant for fall: Aug 28 to Sep 25
Start indoors: Feb 17 to Mar 3Transplant outside: Mar 17 to Mar 31Sow outdoors: Mar 17 to Mar 31Plant for fall: Aug 14 to Sep 4
Start indoors: Feb 17 to Mar 3Transplant outside: Mar 31 to Apr 14Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 17 to Mar 3Transplant outside: Mar 24 to Apr 7Plant for fall: Jul 17 to Aug 7
Start indoors: Feb 17 to Mar 3Transplant outside: Mar 31 to Apr 14Plant for fall: Jul 17 to Aug 7
Start indoors: Mar 3 to Mar 17Transplant outside: May 5 to May 19Sow outdoors: May 5 to May 19
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 21 to May 5
Sow outdoors: Mar 3 to Mar 24Plant for fall: Jul 31 to Aug 21
Sow outdoors: Mar 3 to Mar 24Plant for fall: Aug 28 to Sep 18
Sow outdoors: Mar 10 to Apr 21Plant for fall: Sep 11 to Oct 2
Start indoors: Mar 17 to Mar 24Transplant outside: Apr 28 to May 5Sow outdoors: Apr 21 to May 5Plant for fall: Aug 7 to Aug 21
Start indoors: Mar 17 to Mar 24Sow outdoors: Apr 21 to May 5Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 17 to Mar 24Sow outdoors: Apr 21 to May 5
Start indoors: Mar 17 to Mar 24Transplant outside: Apr 28 to May 12
Sow outdoors: Mar 24 to Apr 21Plant for fall: Jul 31 to Aug 14
Sow outdoors: Mar 24 to Apr 21Plant for fall: Aug 14 to Aug 28
Sow outdoors: Mar 24 to Apr 14
Sow outdoors: Mar 31 to Apr 28Plant for fall: Aug 14 to Aug 28
Sow outdoors: Mar 31 to Apr 21Plant for fall: Aug 28 to Sep 18
Sow outdoors: Apr 21 to May 12Plant for fall: Aug 7 to Aug 21
Sow outdoors: Apr 21 to May 5
Transplant outside: Apr 28 to May 19
Plant for fall: Oct 9 to Nov 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Sumner, MO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 20 – Feb 3 | Mar 17 – Mar 31 | — | — |
| Peppers | Feb 3 – Feb 17 | Apr 28 – May 12 | — | — |
| Eggplant | Feb 3 – Feb 17 | Apr 28 – May 12 | — | — |
| Tomatoes | Feb 17 – Mar 3 | Apr 21 – May 5 | — | — |
| Lettuce | Feb 17 – Mar 3 | Mar 24 – Apr 7 | Mar 17 – Apr 21 | Aug 28 – Sep 25 |
| Kale | Feb 17 – Mar 3 | Mar 17 – Mar 31 | Mar 17 – Mar 31 | Aug 14 – Sep 4 |
| Broccoli | Feb 17 – Mar 3 | Mar 31 – Apr 14 | — | Jul 17 – Aug 7 |
| Cabbage | Feb 17 – Mar 3 | Mar 24 – Apr 7 | — | Jul 17 – Aug 7 |
| Cauliflower | Feb 17 – Mar 3 | Mar 31 – Apr 14 | — | Jul 17 – Aug 7 |
| Okra | Mar 3 – Mar 17 | May 5 – May 19 | May 5 – May 19 | — |
| Basil | Mar 3 – Mar 17 | Apr 21 – May 5 | — | — |
| Peas | — | — | Mar 3 – Mar 24 | Jul 31 – Aug 21 |
| Spinach | — | — | Mar 3 – Mar 24 | Aug 28 – Sep 18 |
| Radishes | — | — | Mar 10 – Apr 21 | Sep 11 – Oct 2 |
| Cucumbers | Mar 17 – Mar 24 | Apr 28 – May 5 | Apr 21 – May 5 | Aug 7 – Aug 21 |
| Zucchini & Summer Squash | Mar 17 – Mar 24 | — | Apr 21 – May 5 | Aug 14 – Aug 28 |
| Winter Squash & Pumpkins | Mar 17 – Mar 24 | — | Apr 21 – May 5 | — |
| Melons & Watermelon | Mar 17 – Mar 24 | Apr 28 – May 12 | — | — |
| Carrots | — | — | Mar 24 – Apr 21 | Jul 31 – Aug 14 |
| Beets | — | — | Mar 24 – Apr 21 | Aug 14 – Aug 28 |
| Potatoes | — | — | Mar 24 – Apr 14 | — |
| Swiss Chard | — | — | Mar 31 – Apr 28 | Aug 14 – Aug 28 |
| Cilantro | — | — | Mar 31 – Apr 21 | Aug 28 – Sep 18 |
| Green Beans | — | — | Apr 21 – May 12 | Aug 7 – Aug 21 |
| Sweet Corn | — | — | Apr 21 – May 5 | — |
| Sweet Potatoes | — | Apr 28 – May 19 | — | — |
| Garlic | — | — | — | Oct 9 – Nov 13 |
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 Brookfield, MO weather station, 19 km away (elevation 768 ft (234 m)).
Frost dates near Sumner
- Hale Apr 15 · Oct 21
- Mendon Apr 10 · Oct 29
- Laclede Apr 16 · Oct 20
- Rothville Apr 14 · Oct 23
- Meadville Apr 16 · Oct 20
- Triplett Apr 10 · Oct 29
- Brookfield Apr 14 · Oct 23
- Wheeling Apr 15 · Oct 21
- Bosworth Apr 10 · Oct 29
- Tina Apr 16 · Oct 23
Frequently asked questions
When is the last frost in Sumner, MO?
The median last spring frost in Sumner, MO is April 14. There is still about a 10% chance of frost after April 28, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Sumner, MO?
The median first fall frost is October 23, with about a 10% chance of frost before October 9.
How long is the growing season in Sumner, MO?
About 192 days between the median last spring frost and first fall frost.
What planting zone is Sumner, MO?
Sumner, MO is in USDA hardiness zone 6a.