Frost dates for 66095Williamsburg, KS
The average last spring frost in Williamsburg is April 8 and the average first fall frost is October 31, giving a typical growing season of about 205 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 8
- Average first fall frost
- Oct 31
- Growing season
- 205 days
Safer after Apr 22 (1-in-10 risk)
Possible by Oct 18 (1-in-10 risk)
First frost typically in 4 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 4 · Apr 18 · May 1 | Oct 8 · Oct 22 · Nov 2 | 185 days | 100% |
| Frost / freeze (32°F) | Mar 23 · Apr 8 · Apr 22 | Oct 18 · Oct 31 · Nov 14 | 205 days | 100% |
| Hard freeze (28°F) | Mar 10 · Mar 30 · Apr 12 | Oct 27 · Nov 8 · Nov 26 | 224 days | 100% |
Planting calendar for Williamsburg
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 8 – May 14 |
| Tomatoes | Transplant outdoors | Apr 24 – Jul 11 |
| Peppers | Start seeds indoors | Mar 8 – Apr 8 |
| Peppers | Transplant outdoors | May 8 – Jun 8 |
| Eggplant | Start seeds indoors | Mar 25 – Apr 23 |
| Eggplant | Transplant outdoors | May 8 – Jun 8 |
| Cucumbers | Sow outdoors | May 8 – Jul 21 |
| Summer squash | Sow outdoors | Apr 24 – Jun 8 |
| Winter squash & pumpkins | Sow outdoors | May 8 – Jun 8 |
| Snap beans | Sow outdoors | Apr 24 – Aug 13 |
| Sweet corn | Sow outdoors | Apr 24 – Jul 11 |
| Watermelon & cantaloupe | Sow outdoors | May 8 – Jun 8 |
| Okra | Sow outdoors | May 1 – May 24 |
| Peas | Sow outdoors (spring) | Mar 8 – Apr 23 |
| Potatoes | Plant outdoors (spring) | Mar 8 – May 8 |
| Onions | Start seeds indoors (spring) | Jan 25 – Feb 21 |
| Onions | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (spring) | Feb 18 – Mar 24 |
| Broccoli | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (fall) | Jul 1 – Jul 11 |
| Broccoli | Transplant outdoors (fall) | Jul 31 – Aug 11 |
| Cabbage | Start seeds indoors (spring) | Feb 8 – Mar 8 |
| Cabbage | Transplant outdoors (spring) | Mar 8 – Apr 8 |
| Cabbage | Start seeds indoors (fall) | Jun 21 – Jul 21 |
| Cabbage | Transplant outdoors (fall) | Jul 21 – Aug 21 |
| Leaf lettuce | Sow outdoors (spring) | Mar 8 – May 24 |
| Leaf lettuce | Sow outdoors (fall) | Jul 21 – Sep 6 |
| Spinach | Sow outdoors (spring) | Mar 1 – Apr 14 |
| Spinach | Sow outdoors (fall) | Aug 7 – Sep 11 |
| Radishes | Sow outdoors (spring) | Mar 8 – Apr 28 |
| Radishes | Sow outdoors (fall) | Jul 21 – Sep 21 |
| Kale | Sow outdoors (spring) | Mar 25 – Apr 14 |
| Kale | Sow outdoors (fall) | Jul 14 – Aug 21 |
| Carrots | Sow outdoors (spring) | Apr 8 – May 24 |
| Carrots | Sow outdoors (fall) | Jun 21 – Aug 6 |
| Garlic | Plant outdoors (fall) | Oct 21 – Nov 21 |
Where these dates come from
ZIP code 66095 is matched to the NOAA station Pomona Lake, KS, 21.3 km away, at 1,063 ft elevation (49 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Pomona Lake, KS (used) | 1,063 ft | Apr 8 | Oct 31 |
| Ottawa, KS | 905 ft | Apr 18 | Oct 20 |
| Melvern Lake, KS | 1,094 ft | Apr 8 | Oct 30 |
| Garnett 1 E, KS | 998 ft | Apr 17 | Oct 22 |
Frost dates near Williamsburg
- Princeton, KS 66078 · last Apr 18, first Oct 20
- Quenemo, KS 66528 · last Apr 8, first Oct 31
- Pomona, KS 66076 · last Apr 8, first Oct 31
- Richmond, KS 66080 · last Apr 17, first Oct 22
- Melvern, KS 66510 · last Apr 8, first Oct 30
- Ottawa, KS 66067 · last Apr 18, first Oct 20
- Waverly, KS 66871 · last Apr 8, first Oct 30
- Vassar, KS 66543 · last Apr 8, first Oct 31
Frequently asked questions
- When is the last frost in Williamsburg, KS?
- For ZIP code 66095, the average last spring frost (32°F) is April 8, based on NOAA 1991-2020 climate normals for the Pomona Lake, KS weather station. There is a 1-in-10 chance of a frost after April 22.
- When is the first frost in Williamsburg, KS?
- The average first fall frost (32°F) is October 31. There is a 1-in-10 chance of frost by October 18, so tender plants are at risk from that point on.
- How long is the growing season in 66095?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 205 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.