New Boston, MO frost dates
Last spring frostApr 15median date
First fall frostOct 20median date
Growing season188 daysfrost-free
Hardiness zone6aZone 6a
How New Boston compares
- In 8 years out of 10, the last spring frost in New Boston falls between April 1 and May 2, a 31-day window. The first fall frost falls between October 5 and November 1.
- The median last frost is 3 days later than the Missouri median of Apr 12.
- Its 188-day growing season is longer than 26% of the 938 Missouri places with a regular frost season (state median 195 days).
- The last frost is 14 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 116 nights a year at or below 32°F.
- Compared with Columbia, MO, 119 km away, the last frost here is 10 days later than there and the growing season is 21 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 1 |
| 50% (median) | April 15 |
| 10% (safe for tender plants) | May 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 5 |
| 50% (median) | October 20 |
| 90% (late) | November 1 |
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 New Boston, MO
New Boston, MO frost dates — last frost Apr 15, first frost Oct 20, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Jan 21 to Feb 4Transplant outside: Mar 18 to Apr 1
Start indoors: Feb 4 to Feb 18Transplant outside: Apr 29 to May 13
Start indoors: Feb 4 to Feb 18Transplant outside: Apr 29 to May 13
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 22 to May 6
Start indoors: Feb 18 to Mar 4Transplant outside: Mar 25 to Apr 8Sow outdoors: Mar 18 to Apr 22Plant for fall: Aug 25 to Sep 22
Start indoors: Feb 18 to Mar 4Transplant outside: Mar 18 to Apr 1Sow outdoors: Mar 18 to Apr 1Plant for fall: Aug 11 to Sep 1
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 1 to Apr 15Plant for fall: Jul 14 to Aug 4
Start indoors: Feb 18 to Mar 4Transplant outside: Mar 25 to Apr 8Plant for fall: Jul 14 to Aug 4
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 1 to Apr 15Plant for fall: Jul 14 to Aug 4
Start indoors: Mar 4 to Mar 18Transplant outside: May 6 to May 20Sow outdoors: May 6 to May 20
Start indoors: Mar 4 to Mar 18Transplant outside: Apr 22 to May 6
Sow outdoors: Mar 4 to Mar 25Plant for fall: Jul 28 to Aug 18
Sow outdoors: Mar 4 to Mar 25Plant for fall: Aug 25 to Sep 15
Sow outdoors: Mar 11 to Apr 22Plant for fall: Sep 8 to Sep 29
Start indoors: Mar 18 to Mar 25Transplant outside: Apr 29 to May 6Sow outdoors: Apr 22 to May 6Plant for fall: Aug 4 to Aug 18
Start indoors: Mar 18 to Mar 25Sow outdoors: Apr 22 to May 6Plant for fall: Aug 11 to Aug 25
Start indoors: Mar 18 to Mar 25Sow outdoors: Apr 22 to May 6
Start indoors: Mar 18 to Mar 25Transplant outside: Apr 29 to May 13
Sow outdoors: Mar 25 to Apr 22Plant for fall: Jul 28 to Aug 11
Sow outdoors: Mar 25 to Apr 22Plant for fall: Aug 11 to Aug 25
Sow outdoors: Mar 25 to Apr 15
Sow outdoors: Apr 1 to Apr 29Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 1 to Apr 22Plant for fall: Aug 25 to Sep 15
Sow outdoors: Apr 22 to May 13Plant for fall: Aug 4 to Aug 18
Sow outdoors: Apr 22 to May 6
Transplant outside: Apr 29 to May 20
Plant for fall: Oct 6 to Nov 10
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in New Boston, MO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 21 – Feb 4 | Mar 18 – Apr 1 | — | — |
| Peppers | Feb 4 – Feb 18 | Apr 29 – May 13 | — | — |
| Eggplant | Feb 4 – Feb 18 | Apr 29 – May 13 | — | — |
| Tomatoes | Feb 18 – Mar 4 | Apr 22 – May 6 | — | — |
| Lettuce | Feb 18 – Mar 4 | Mar 25 – Apr 8 | Mar 18 – Apr 22 | Aug 25 – Sep 22 |
| Kale | Feb 18 – Mar 4 | Mar 18 – Apr 1 | Mar 18 – Apr 1 | Aug 11 – Sep 1 |
| Broccoli | Feb 18 – Mar 4 | Apr 1 – Apr 15 | — | Jul 14 – Aug 4 |
| Cabbage | Feb 18 – Mar 4 | Mar 25 – Apr 8 | — | Jul 14 – Aug 4 |
| Cauliflower | Feb 18 – Mar 4 | Apr 1 – Apr 15 | — | Jul 14 – Aug 4 |
| Okra | Mar 4 – Mar 18 | May 6 – May 20 | May 6 – May 20 | — |
| Basil | Mar 4 – Mar 18 | Apr 22 – May 6 | — | — |
| Peas | — | — | Mar 4 – Mar 25 | Jul 28 – Aug 18 |
| Spinach | — | — | Mar 4 – Mar 25 | Aug 25 – Sep 15 |
| Radishes | — | — | Mar 11 – Apr 22 | Sep 8 – Sep 29 |
| Cucumbers | Mar 18 – Mar 25 | Apr 29 – May 6 | Apr 22 – May 6 | Aug 4 – Aug 18 |
| Zucchini & Summer Squash | Mar 18 – Mar 25 | — | Apr 22 – May 6 | Aug 11 – Aug 25 |
| Winter Squash & Pumpkins | Mar 18 – Mar 25 | — | Apr 22 – May 6 | — |
| Melons & Watermelon | Mar 18 – Mar 25 | Apr 29 – May 13 | — | — |
| Carrots | — | — | Mar 25 – Apr 22 | Jul 28 – Aug 11 |
| Beets | — | — | Mar 25 – Apr 22 | Aug 11 – Aug 25 |
| Potatoes | — | — | Mar 25 – Apr 15 | — |
| Swiss Chard | — | — | Apr 1 – Apr 29 | Aug 11 – Aug 25 |
| Cilantro | — | — | Apr 1 – Apr 22 | Aug 25 – Sep 15 |
| Green Beans | — | — | Apr 22 – May 13 | Aug 4 – Aug 18 |
| Sweet Corn | — | — | Apr 22 – May 6 | — |
| Sweet Potatoes | — | Apr 29 – May 20 | — | — |
| Garlic | — | — | — | Oct 6 – Nov 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 Chillicothe 22 Ene, MO weather station, 21 km away (elevation 833 ft (254 m)).
Frost dates near New Boston
- Winigan Apr 15 · Oct 20
- Ethel Apr 19 · Oct 18
- Bucklin Apr 14 · Oct 23
- Brookfield Apr 14 · Oct 23
- Purdin Apr 15 · Oct 20
- Elmer Apr 19 · Oct 18
- Linneus Apr 15 · Oct 20
- New Cambria Apr 8 · Oct 28
- Browning Apr 15 · Oct 20
- Marceline Apr 14 · Oct 23
Frequently asked questions
When is the last frost in New Boston, MO?
The median last spring frost in New Boston, MO is April 15. There is still about a 10% chance of frost after May 2, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in New Boston, MO?
The median first fall frost is October 20, with about a 10% chance of frost before October 5.
How long is the growing season in New Boston, MO?
About 188 days between the median last spring frost and first fall frost.
What planting zone is New Boston, MO?
New Boston, MO is in USDA hardiness zone 6a.