Humboldt, KS frost dates
Last spring frostApr 11median date
First fall frostOct 27median date
Growing season199 daysfrost-free
Hardiness zone6bZone 6b
How Humboldt compares
- In 8 years out of 10, the last spring frost in Humboldt falls between March 27 and April 29, a 33-day window. The first fall frost falls between October 10 and November 9.
- The median last frost is 7 days earlier than the Kansas median of Apr 18.
- Its 199-day growing season is longer than 80% of the 632 Kansas places with a regular frost season (state median 187 days).
- The last frost is 11 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 111 nights a year at or below 32°F.
- Compared with Joplin, MO, 114 km away, the last frost here is 2 days later than there and the growing season is 2 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 27 |
| 50% (median) | April 11 |
| 10% (safe for tender plants) | April 29 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 10 |
| 50% (median) | October 27 |
| 90% (late) | November 9 |
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 Humboldt, KS
Humboldt, KS frost dates — last frost Apr 11, first frost Oct 27, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 17 to Jan 31Transplant outside: Mar 14 to Mar 28
Start indoors: Jan 31 to Feb 14Transplant outside: Apr 25 to May 9
Start indoors: Jan 31 to Feb 14Transplant outside: Apr 25 to May 9
Start indoors: Feb 14 to Feb 28Transplant outside: Apr 18 to May 2
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 21 to Apr 4Sow outdoors: Mar 14 to Apr 18Plant for fall: Sep 1 to Sep 29
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 14 to Mar 28Sow outdoors: Mar 14 to Mar 28Plant for fall: Aug 18 to Sep 8
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 28 to Apr 11Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 21 to Apr 4Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 14 to Feb 28Transplant outside: Mar 28 to Apr 11Plant for fall: Jul 21 to Aug 11
Start indoors: Feb 28 to Mar 14Transplant outside: May 2 to May 16Sow outdoors: May 2 to May 16
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 18 to May 2
Sow outdoors: Feb 28 to Mar 21Plant for fall: Aug 4 to Aug 25
Sow outdoors: Feb 28 to Mar 21Plant for fall: Sep 1 to Sep 22
Sow outdoors: Mar 7 to Apr 18Plant for fall: Sep 15 to Oct 6
Start indoors: Mar 14 to Mar 21Transplant outside: Apr 25 to May 2Sow outdoors: Apr 18 to May 2Plant for fall: Aug 11 to Aug 25
Start indoors: Mar 14 to Mar 21Sow outdoors: Apr 18 to May 2Plant for fall: Aug 18 to Sep 1
Start indoors: Mar 14 to Mar 21Sow outdoors: Apr 18 to May 2
Start indoors: Mar 14 to Mar 21Transplant outside: Apr 25 to May 9
Sow outdoors: Mar 21 to Apr 18Plant for fall: Aug 4 to Aug 18
Sow outdoors: Mar 21 to Apr 18Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 21 to Apr 11
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 28 to Apr 18Plant for fall: Sep 1 to Sep 22
Sow outdoors: Apr 18 to May 9Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 18 to May 2
Transplant outside: Apr 25 to May 16
Plant for fall: Oct 13 to Nov 17
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Humboldt, KS
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 17 – Jan 31 | Mar 14 – Mar 28 | — | — |
| Peppers | Jan 31 – Feb 14 | Apr 25 – May 9 | — | — |
| Eggplant | Jan 31 – Feb 14 | Apr 25 – May 9 | — | — |
| Tomatoes | Feb 14 – Feb 28 | Apr 18 – May 2 | — | — |
| Lettuce | Feb 14 – Feb 28 | Mar 21 – Apr 4 | Mar 14 – Apr 18 | Sep 1 – Sep 29 |
| Kale | Feb 14 – Feb 28 | Mar 14 – Mar 28 | Mar 14 – Mar 28 | Aug 18 – Sep 8 |
| Broccoli | Feb 14 – Feb 28 | Mar 28 – Apr 11 | — | Jul 21 – Aug 11 |
| Cabbage | Feb 14 – Feb 28 | Mar 21 – Apr 4 | — | Jul 21 – Aug 11 |
| Cauliflower | Feb 14 – Feb 28 | Mar 28 – Apr 11 | — | Jul 21 – Aug 11 |
| Okra | Feb 28 – Mar 14 | May 2 – May 16 | May 2 – May 16 | — |
| Basil | Feb 28 – Mar 14 | Apr 18 – May 2 | — | — |
| Peas | — | — | Feb 28 – Mar 21 | Aug 4 – Aug 25 |
| Spinach | — | — | Feb 28 – Mar 21 | Sep 1 – Sep 22 |
| Radishes | — | — | Mar 7 – Apr 18 | Sep 15 – Oct 6 |
| Cucumbers | Mar 14 – Mar 21 | Apr 25 – May 2 | Apr 18 – May 2 | Aug 11 – Aug 25 |
| Zucchini & Summer Squash | Mar 14 – Mar 21 | — | Apr 18 – May 2 | Aug 18 – Sep 1 |
| Winter Squash & Pumpkins | Mar 14 – Mar 21 | — | Apr 18 – May 2 | — |
| Melons & Watermelon | Mar 14 – Mar 21 | Apr 25 – May 9 | — | — |
| Carrots | — | — | Mar 21 – Apr 18 | Aug 4 – Aug 18 |
| Beets | — | — | Mar 21 – Apr 18 | Aug 18 – Sep 1 |
| Potatoes | — | — | Mar 21 – Apr 11 | — |
| Swiss Chard | — | — | Mar 28 – Apr 25 | Aug 18 – Sep 1 |
| Cilantro | — | — | Mar 28 – Apr 18 | Sep 1 – Sep 22 |
| Green Beans | — | — | Apr 18 – May 9 | Aug 11 – Aug 25 |
| Sweet Corn | — | — | Apr 18 – May 2 | — |
| Sweet Potatoes | — | Apr 25 – May 16 | — | — |
| 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 Humboldt, KS weather station, 2 km away (elevation 942 ft (287 m)).
Frost dates near Humboldt
- Iola Apr 8 · Oct 26
- Chanute Apr 10 · Oct 28
- Gas Apr 8 · Oct 26
- Piqua Apr 8 · Oct 26
- La Harpe Apr 8 · Oct 26
- Neosho Falls Apr 8 · Oct 26
- Elsmore Apr 8 · Oct 29
- Savonburg Apr 8 · Oct 29
- Moran Apr 8 · Oct 26
- Erie Apr 8 · Oct 29
Frequently asked questions
When is the last frost in Humboldt, KS?
The median last spring frost in Humboldt, KS is April 11. There is still about a 10% chance of frost after April 29, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Humboldt, KS?
The median first fall frost is October 27, with about a 10% chance of frost before October 10.
How long is the growing season in Humboldt, KS?
About 199 days between the median last spring frost and first fall frost.
What planting zone is Humboldt, KS?
Humboldt, KS is in USDA hardiness zone 6b.