Blackwater, MO frost dates
Last spring frostApr 5median date
First fall frostOct 29median date
Growing season207 daysfrost-free
Hardiness zone6bZone 6b
How Blackwater compares
- In 8 years out of 10, the last spring frost in Blackwater falls between March 19 and April 19, a 31-day window. The first fall frost falls between October 16 and November 11.
- The median last frost is 7 days earlier than the Missouri median of Apr 12.
- Its 207-day growing season is longer than 84% of the 938 Missouri places with a regular frost season (state median 195 days).
- The last frost is 17 days earlier than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 105 nights a year at or below 32°F.
- Compared with Columbia, MO, 55 km away, the last frost here is the same as there and the growing season is 2 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 19 |
| 50% (median) | April 5 |
| 10% (safe for tender plants) | April 19 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 16 |
| 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 Blackwater, MO
Blackwater, MO frost dates — last frost Apr 5, first frost Oct 29, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 11 to Jan 25Transplant outside: Mar 8 to Mar 22
Start indoors: Jan 25 to Feb 8Transplant outside: Apr 19 to May 3
Start indoors: Jan 25 to Feb 8Transplant outside: Apr 19 to May 3
Start indoors: Feb 8 to Feb 22Transplant outside: Apr 12 to Apr 26
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 15 to Mar 29Sow outdoors: Mar 8 to Apr 12Plant for fall: Sep 3 to Oct 1
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 8 to Mar 22Sow outdoors: Mar 8 to Mar 22Plant for fall: Aug 20 to Sep 10
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 22 to Apr 5Plant for fall: Jul 23 to Aug 13
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 15 to Mar 29Plant for fall: Jul 23 to Aug 13
Start indoors: Feb 8 to Feb 22Transplant outside: Mar 22 to Apr 5Plant for fall: Jul 23 to Aug 13
Start indoors: Feb 22 to Mar 8Transplant outside: Apr 26 to May 10Sow outdoors: Apr 26 to May 10
Start indoors: Feb 22 to Mar 8Transplant outside: Apr 12 to Apr 26
Sow outdoors: Feb 22 to Mar 15Plant for fall: Aug 6 to Aug 27
Sow outdoors: Feb 22 to Mar 15Plant for fall: Sep 3 to Sep 24
Sow outdoors: Mar 1 to Apr 12Plant for fall: Sep 17 to Oct 8
Start indoors: Mar 8 to Mar 15Transplant outside: Apr 19 to Apr 26Sow outdoors: Apr 12 to Apr 26Plant for fall: Aug 13 to Aug 27
Start indoors: Mar 8 to Mar 15Sow outdoors: Apr 12 to Apr 26Plant for fall: Aug 20 to Sep 3
Start indoors: Mar 8 to Mar 15Sow outdoors: Apr 12 to Apr 26
Start indoors: Mar 8 to Mar 15Transplant outside: Apr 19 to May 3
Sow outdoors: Mar 15 to Apr 12Plant for fall: Aug 6 to Aug 20
Sow outdoors: Mar 15 to Apr 12Plant for fall: Aug 20 to Sep 3
Sow outdoors: Mar 15 to Apr 5
Sow outdoors: Mar 22 to Apr 19Plant for fall: Aug 20 to Sep 3
Sow outdoors: Mar 22 to Apr 12Plant for fall: Sep 3 to Sep 24
Sow outdoors: Apr 12 to May 3Plant for fall: Aug 13 to Aug 27
Sow outdoors: Apr 12 to Apr 26
Transplant outside: Apr 19 to May 10
Plant for fall: Oct 15 to Nov 19
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Blackwater, MO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 11 – Jan 25 | Mar 8 – Mar 22 | — | — |
| Peppers | Jan 25 – Feb 8 | Apr 19 – May 3 | — | — |
| Eggplant | Jan 25 – Feb 8 | Apr 19 – May 3 | — | — |
| Tomatoes | Feb 8 – Feb 22 | Apr 12 – Apr 26 | — | — |
| Lettuce | Feb 8 – Feb 22 | Mar 15 – Mar 29 | Mar 8 – Apr 12 | Sep 3 – Oct 1 |
| Kale | Feb 8 – Feb 22 | Mar 8 – Mar 22 | Mar 8 – Mar 22 | Aug 20 – Sep 10 |
| Broccoli | Feb 8 – Feb 22 | Mar 22 – Apr 5 | — | Jul 23 – Aug 13 |
| Cabbage | Feb 8 – Feb 22 | Mar 15 – Mar 29 | — | Jul 23 – Aug 13 |
| Cauliflower | Feb 8 – Feb 22 | Mar 22 – Apr 5 | — | Jul 23 – Aug 13 |
| Okra | Feb 22 – Mar 8 | Apr 26 – May 10 | Apr 26 – May 10 | — |
| Basil | Feb 22 – Mar 8 | Apr 12 – Apr 26 | — | — |
| Peas | — | — | Feb 22 – Mar 15 | Aug 6 – Aug 27 |
| Spinach | — | — | Feb 22 – Mar 15 | Sep 3 – Sep 24 |
| Radishes | — | — | Mar 1 – Apr 12 | Sep 17 – Oct 8 |
| Cucumbers | Mar 8 – Mar 15 | Apr 19 – Apr 26 | Apr 12 – Apr 26 | Aug 13 – Aug 27 |
| Zucchini & Summer Squash | Mar 8 – Mar 15 | — | Apr 12 – Apr 26 | Aug 20 – Sep 3 |
| Winter Squash & Pumpkins | Mar 8 – Mar 15 | — | Apr 12 – Apr 26 | — |
| Melons & Watermelon | Mar 8 – Mar 15 | Apr 19 – May 3 | — | — |
| Carrots | — | — | Mar 15 – Apr 12 | Aug 6 – Aug 20 |
| Beets | — | — | Mar 15 – Apr 12 | Aug 20 – Sep 3 |
| Potatoes | — | — | Mar 15 – Apr 5 | — |
| Swiss Chard | — | — | Mar 22 – Apr 19 | Aug 20 – Sep 3 |
| Cilantro | — | — | Mar 22 – Apr 12 | Sep 3 – Sep 24 |
| Green Beans | — | — | Apr 12 – May 3 | Aug 13 – Aug 27 |
| Sweet Corn | — | — | Apr 12 – Apr 26 | — |
| Sweet Potatoes | — | Apr 19 – May 10 | — | — |
| 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 Boonville, MO weather station, 18 km away (elevation 745 ft (227 m)).
Frost dates near Blackwater
- Nelson Apr 10 · Oct 24
- Arrow Rock Apr 13 · Oct 22
- Pilot Grove Apr 5 · Oct 29
- Franklin Apr 13 · Oct 22
- Boonville Apr 12 · Oct 25
- New Franklin Apr 13 · Oct 22
- Bunceton Apr 12 · Oct 25
- Hughesville Apr 10 · Oct 26
- Slater Apr 10 · Oct 24
- Otterville Apr 10 · Oct 26
Frequently asked questions
When is the last frost in Blackwater, MO?
The median last spring frost in Blackwater, MO is April 5. There is still about a 10% chance of frost after April 19, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Blackwater, MO?
The median first fall frost is October 29, with about a 10% chance of frost before October 16.
How long is the growing season in Blackwater, MO?
About 207 days between the median last spring frost and first fall frost.
What planting zone is Blackwater, MO?
Blackwater, MO is in USDA hardiness zone 6b.