Frost dates for 66517Ogden, KS
The average last spring frost in Ogden is April 21 and the average first fall frost is October 16, giving a typical growing season of about 177 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 21
- Average first fall frost
- Oct 16
- Growing season
- 177 days
Safer after May 6 (1-in-10 risk)
Possible by Oct 1 (1-in-10 risk)
Last frost typically in 169 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 17 · May 1 · May 14 | Sep 23 · Oct 6 · Oct 18 | 157 days | 100% |
| Frost / freeze (32°F) | Apr 8 · Apr 21 · May 6 | Oct 1 · Oct 16 · Oct 29 | 177 days | 100% |
| Hard freeze (28°F) | Mar 26 · Apr 10 · Apr 26 | Oct 12 · Oct 25 · Nov 6 | 197 days | 100% |
Planting calendar for Ogden
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 21 – May 27 |
| Tomatoes | Transplant outdoors | May 7 – Jun 26 |
| Peppers | Start seeds indoors | Mar 21 – Apr 21 |
| Peppers | Transplant outdoors | May 21 – Jun 21 |
| Eggplant | Start seeds indoors | Apr 7 – May 6 |
| Eggplant | Transplant outdoors | May 21 – Jun 21 |
| Cucumbers | Sow outdoors | May 21 – Jul 6 |
| Summer squash | Sow outdoors | May 7 – Jun 21 |
| Winter squash & pumpkins | Sow outdoors | May 21 – Jun 21 |
| Snap beans | Sow outdoors | May 7 – Jul 29 |
| Sweet corn | Sow outdoors | May 7 – Jun 26 |
| Watermelon & cantaloupe | Sow outdoors | May 21 – Jun 21 |
| Okra | Sow outdoors | May 14 – Jun 6 |
| Peas | Sow outdoors (spring) | Mar 21 – May 6 |
| Potatoes | Plant outdoors (spring) | Mar 21 – May 21 |
| Onions | Start seeds indoors (spring) | Feb 7 – Mar 6 |
| Onions | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (spring) | Mar 3 – Apr 6 |
| Broccoli | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (fall) | Jun 16 – Jun 26 |
| Broccoli | Transplant outdoors (fall) | Jul 16 – Jul 27 |
| Cabbage | Start seeds indoors (spring) | Feb 21 – Mar 21 |
| Cabbage | Transplant outdoors (spring) | Mar 21 – Apr 21 |
| Cabbage | Start seeds indoors (fall) | Jun 6 – Jul 6 |
| Cabbage | Transplant outdoors (fall) | Jul 6 – Aug 6 |
| Leaf lettuce | Sow outdoors (spring) | Mar 21 – Jun 6 |
| Leaf lettuce | Sow outdoors (fall) | Jul 6 – Aug 22 |
| Spinach | Sow outdoors (spring) | Mar 14 – Apr 27 |
| Spinach | Sow outdoors (fall) | Jul 23 – Aug 27 |
| Radishes | Sow outdoors (spring) | Mar 21 – May 11 |
| Radishes | Sow outdoors (fall) | Jul 6 – Sep 6 |
| Kale | Sow outdoors (spring) | Apr 7 – Apr 27 |
| Kale | Sow outdoors (fall) | Jun 29 – Aug 6 |
| Carrots | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Carrots | Sow outdoors (fall) | Jun 6 – Jul 22 |
| Garlic | Plant outdoors (fall) | Oct 6 – Nov 6 |
Where these dates come from
ZIP code 66517 is matched to the NOAA station Manhattan Muni Ap, KS, 3.6 km away, at 1,057 ft elevation (4 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Manhattan Muni Ap, KS (used) | 1,057 ft | Apr 21 | Oct 16 |
| Manhattan 6 Ssw, KS | 1,137 ft | Apr 19 | Oct 17 |
| Manhattan, KS | 1,060 ft | Apr 16 | Oct 19 |
| Milford Lake, KS | 1,213 ft | Apr 12 | Oct 26 |
Frost dates near Ogden
- Fort Riley, KS 66442 · last Apr 12, first Oct 26
- Manhattan, KS 66502 · last Apr 16, first Oct 19
- Junction City, KS 66441 · last Apr 12, first Oct 26
- Milford, KS 66514 · last Apr 12, first Oct 26
- Riley, KS 66531 · last Apr 12, first Oct 26
- Saint George, KS 66535 · last Apr 18, first Oct 19
- Wakefield, KS 67487 · last Apr 19, first Oct 19
- Leonardville, KS 66449 · last Apr 19, first Oct 19
Frequently asked questions
- When is the last frost in Ogden, KS?
- For ZIP code 66517, the average last spring frost (32°F) is April 21, based on NOAA 1991-2020 climate normals for the Manhattan Muni Ap, KS weather station. There is a 1-in-10 chance of a frost after May 6.
- When is the first frost in Ogden, KS?
- The average first fall frost (32°F) is October 16. There is a 1-in-10 chance of frost by October 1, so tender plants are at risk from that point on.
- How long is the growing season in 66517?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 177 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.