Frost dates for 66748Humboldt, KS
The average last spring frost in Humboldt is April 11 and the average first fall frost is October 27, giving a typical growing season of about 195 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 11
- Average first fall frost
- Oct 27
- Growing season
- 195 days
Safer after Apr 29 (1-in-10 risk)
Possible by Oct 10 (1-in-10 risk)
First frost typically in 0 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 7 · Apr 23 · May 6 | Sep 30 · Oct 16 · Oct 29 | 174 days | 100% |
| Frost / freeze (32°F) | Mar 27 · Apr 11 · Apr 29 | Oct 10 · Oct 27 · Nov 9 | 195 days | 100% |
| Hard freeze (28°F) | Mar 16 · Apr 2 · Apr 20 | Oct 20 · Nov 4 · Nov 19 | 215 days | 100% |
Planting calendar for Humboldt
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 11 – May 17 |
| Tomatoes | Transplant outdoors | Apr 27 – Jul 7 |
| Peppers | Start seeds indoors | Mar 11 – Apr 11 |
| Peppers | Transplant outdoors | May 11 – Jun 11 |
| Eggplant | Start seeds indoors | Mar 28 – Apr 26 |
| Eggplant | Transplant outdoors | May 11 – Jun 11 |
| Cucumbers | Sow outdoors | May 11 – Jul 17 |
| Summer squash | Sow outdoors | Apr 27 – Jun 11 |
| Winter squash & pumpkins | Sow outdoors | May 11 – Jun 11 |
| Snap beans | Sow outdoors | Apr 27 – Aug 9 |
| Sweet corn | Sow outdoors | Apr 27 – Jul 7 |
| Watermelon & cantaloupe | Sow outdoors | May 11 – Jun 11 |
| Okra | Sow outdoors | May 4 – May 27 |
| Peas | Sow outdoors (spring) | Mar 11 – Apr 26 |
| Potatoes | Plant outdoors (spring) | Mar 11 – May 11 |
| Onions | Start seeds indoors (spring) | Jan 28 – Feb 24 |
| Onions | Transplant outdoors (spring) | Mar 28 – Apr 26 |
| Broccoli | Start seeds indoors (spring) | Feb 21 – Mar 27 |
| Broccoli | Transplant outdoors (spring) | Mar 28 – Apr 26 |
| Broccoli | Start seeds indoors (fall) | Jun 27 – Jul 7 |
| Broccoli | Transplant outdoors (fall) | Jul 27 – Aug 7 |
| Cabbage | Start seeds indoors (spring) | Feb 11 – Mar 11 |
| Cabbage | Transplant outdoors (spring) | Mar 11 – Apr 11 |
| Cabbage | Start seeds indoors (fall) | Jun 17 – Jul 17 |
| Cabbage | Transplant outdoors (fall) | Jul 17 – Aug 17 |
| Leaf lettuce | Sow outdoors (spring) | Mar 11 – May 27 |
| Leaf lettuce | Sow outdoors (fall) | Jul 17 – Sep 2 |
| Spinach | Sow outdoors (spring) | Mar 4 – Apr 17 |
| Spinach | Sow outdoors (fall) | Aug 3 – Sep 7 |
| Radishes | Sow outdoors (spring) | Mar 11 – May 1 |
| Radishes | Sow outdoors (fall) | Jul 17 – Sep 17 |
| Kale | Sow outdoors (spring) | Mar 28 – Apr 17 |
| Kale | Sow outdoors (fall) | Jul 10 – Aug 17 |
| Carrots | Sow outdoors (spring) | Apr 11 – May 27 |
| Carrots | Sow outdoors (fall) | Jun 17 – Aug 2 |
| Garlic | Plant outdoors (fall) | Oct 17 – Nov 17 |
Where these dates come from
ZIP code 66748 is matched to the NOAA station Humboldt, KS, 2.2 km away, at 940 ft elevation (18 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Humboldt, KS (used) | 940 ft | Apr 11 | Oct 27 |
| Iola 1 W, KS | 954 ft | Apr 8 | Oct 26 |
| Chanute 4E, KS | 992 ft | Apr 8 | Oct 29 |
| Chanute Martin Johnson Ap, KS | 985 ft | Apr 10 | Oct 28 |
Frost dates near Humboldt
- Iola, KS 66749 · last Apr 8, first Oct 26
- Chanute, KS 66720 · last Apr 10, first Oct 28
- Gas, KS 66742 · last Apr 8, first Oct 26
- Piqua, KS 66761 · last Apr 8, first Oct 26
- La Harpe, KS 66751 · last Apr 8, first Oct 26
- Neosho Falls, KS 66758 · last Apr 8, first Oct 26
- Elsmore, KS 66732 · last Apr 8, first Oct 29
- Savonburg, KS 66772 · last Apr 8, first Oct 29
Frequently asked questions
- When is the last frost in Humboldt, KS?
- For ZIP code 66748, the average last spring frost (32°F) is April 11, based on NOAA 1991-2020 climate normals for the Humboldt, KS weather station. There is a 1-in-10 chance of a frost after April 29.
- When is the first frost in Humboldt, KS?
- The average first fall frost (32°F) is October 27. There is a 1-in-10 chance of frost by October 10, so tender plants are at risk from that point on.
- How long is the growing season in 66748?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 195 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.