Fort Leavenworth, KS frost dates
Last spring frostApr 12median date
First fall frostOct 27median date
Growing season198 daysfrost-free
Hardiness zone6bZone 6b
How Fort Leavenworth compares
- In 8 years out of 10, the last spring frost in Fort Leavenworth falls between March 31 and April 25, a 25-day window. The first fall frost falls between October 13 and November 7.
- The median last frost is 6 days earlier than the Kansas median of Apr 18.
- Its 198-day growing season is longer than 78% of the 632 Kansas places with a regular frost season (state median 187 days).
- The last frost is 10 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 Kansas City, KS, 34 km away, the last frost here is 8 days later than there and the growing season is 14 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 31 |
| 50% (median) | April 12 |
| 10% (safe for tender plants) | April 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 13 |
| 50% (median) | October 27 |
| 90% (late) | November 7 |
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 Fort Leavenworth, KS
Fort Leavenworth, KS frost dates — last frost Apr 12, first frost Oct 27, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 18 to Feb 1Transplant outside: Mar 15 to Mar 29
Start indoors: Feb 1 to Feb 15Transplant outside: Apr 26 to May 10
Start indoors: Feb 1 to Feb 15Transplant outside: Apr 26 to May 10
Start indoors: Feb 15 to Mar 1Transplant outside: Apr 19 to May 3
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 22 to Apr 5Sow outdoors: Mar 15 to Apr 19Plant for fall: Sep 1 to Sep 29
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 15 to Mar 29Sow outdoors: Mar 15 to Mar 29Plant for fall: Aug 18 to Sep 8
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 29 to Apr 12Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 22 to Apr 5Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 15 to Mar 1Transplant outside: Mar 29 to Apr 12Plant for fall: Jul 21 to Aug 11
Start indoors: Mar 1 to Mar 15Transplant outside: May 3 to May 17Sow outdoors: May 3 to May 17
Start indoors: Mar 1 to Mar 15Transplant outside: Apr 19 to May 3
Sow outdoors: Mar 1 to Mar 22Plant for fall: Aug 4 to Aug 25
Sow outdoors: Mar 1 to Mar 22Plant for fall: Sep 1 to Sep 22
Sow outdoors: Mar 8 to Apr 19Plant for fall: Sep 15 to Oct 6
Start indoors: Mar 15 to Mar 22Transplant outside: Apr 26 to May 3Sow outdoors: Apr 19 to May 3Plant for fall: Aug 11 to Aug 25
Start indoors: Mar 15 to Mar 22Sow outdoors: Apr 19 to May 3Plant for fall: Aug 18 to Sep 1
Start indoors: Mar 15 to Mar 22Sow outdoors: Apr 19 to May 3
Start indoors: Mar 15 to Mar 22Transplant outside: Apr 26 to May 10
Sow outdoors: Mar 22 to Apr 19Plant for fall: Aug 4 to Aug 18
Sow outdoors: Mar 22 to Apr 19Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 22 to Apr 12
Sow outdoors: Mar 29 to Apr 26Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 29 to Apr 19Plant for fall: Sep 1 to Sep 22
Sow outdoors: Apr 19 to May 10Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 19 to May 3
Transplant outside: Apr 26 to May 17
Plant for fall: Oct 13 to Nov 17
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Fort Leavenworth, KS
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 18 – Feb 1 | Mar 15 – Mar 29 | — | — |
| Peppers | Feb 1 – Feb 15 | Apr 26 – May 10 | — | — |
| Eggplant | Feb 1 – Feb 15 | Apr 26 – May 10 | — | — |
| Tomatoes | Feb 15 – Mar 1 | Apr 19 – May 3 | — | — |
| Lettuce | Feb 15 – Mar 1 | Mar 22 – Apr 5 | Mar 15 – Apr 19 | Sep 1 – Sep 29 |
| Kale | Feb 15 – Mar 1 | Mar 15 – Mar 29 | Mar 15 – Mar 29 | Aug 18 – Sep 8 |
| Broccoli | Feb 15 – Mar 1 | Mar 29 – Apr 12 | — | Jul 21 – Aug 11 |
| Cabbage | Feb 15 – Mar 1 | Mar 22 – Apr 5 | — | Jul 21 – Aug 11 |
| Cauliflower | Feb 15 – Mar 1 | Mar 29 – Apr 12 | — | Jul 21 – Aug 11 |
| Okra | Mar 1 – Mar 15 | May 3 – May 17 | May 3 – May 17 | — |
| Basil | Mar 1 – Mar 15 | Apr 19 – May 3 | — | — |
| Peas | — | — | Mar 1 – Mar 22 | Aug 4 – Aug 25 |
| Spinach | — | — | Mar 1 – Mar 22 | Sep 1 – Sep 22 |
| Radishes | — | — | Mar 8 – Apr 19 | Sep 15 – Oct 6 |
| Cucumbers | Mar 15 – Mar 22 | Apr 26 – May 3 | Apr 19 – May 3 | Aug 11 – Aug 25 |
| Zucchini & Summer Squash | Mar 15 – Mar 22 | — | Apr 19 – May 3 | Aug 18 – Sep 1 |
| Winter Squash & Pumpkins | Mar 15 – Mar 22 | — | Apr 19 – May 3 | — |
| Melons & Watermelon | Mar 15 – Mar 22 | Apr 26 – May 10 | — | — |
| Carrots | — | — | Mar 22 – Apr 19 | Aug 4 – Aug 18 |
| Beets | — | — | Mar 22 – Apr 19 | Aug 18 – Sep 1 |
| Potatoes | — | — | Mar 22 – Apr 12 | — |
| Swiss Chard | — | — | Mar 29 – Apr 26 | Aug 18 – Sep 1 |
| Cilantro | — | — | Mar 29 – Apr 19 | Sep 1 – Sep 22 |
| Green Beans | — | — | Apr 19 – May 10 | Aug 11 – Aug 25 |
| Sweet Corn | — | — | Apr 19 – May 3 | — |
| Sweet Potatoes | — | Apr 26 – May 17 | — | — |
| Garlic | — | — | — | Oct 13 – Nov 17 |
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 Leavenworth, KS weather station, 3 km away (elevation 869 ft (265 m)).
Frost dates near Fort Leavenworth
- Leavenworth Apr 19 · Oct 19
- Lansing Apr 19 · Oct 19
- Easton Apr 19 · Oct 19
- Basehor Apr 16 · Oct 22
- Atchison Apr 11 · Oct 29
- Winchester Apr 16 · Oct 22
- Tonganoxie Apr 21 · Oct 17
- Bonner Springs Apr 16 · Oct 22
- Mc Louth Apr 16 · Oct 22
- Kansas City Apr 4 · Nov 2
Frequently asked questions
When is the last frost in Fort Leavenworth, KS?
The median last spring frost in Fort Leavenworth, KS is April 12. There is still about a 10% chance of frost after April 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Fort Leavenworth, KS?
The median first fall frost is October 27, with about a 10% chance of frost before October 13.
How long is the growing season in Fort Leavenworth, KS?
About 198 days between the median last spring frost and first fall frost.
What planting zone is Fort Leavenworth, KS?
Fort Leavenworth, KS is in USDA hardiness zone 6b.