Frost dates for 83323Declo, ID
The average last spring frost in Declo is June 5 and the average first fall frost is September 13, giving a typical growing season of about 96 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 5
- Average first fall frost
- Sep 13
- Growing season
- 96 days
Safer after Jun 23 (1-in-10 risk)
Possible by Aug 28 (1-in-10 risk)
Last frost typically in 214 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) | — | — | 69 days | 100% |
| Frost / freeze (32°F) | May 19 · Jun 5 · Jun 23 | Aug 28 · Sep 13 · Sep 28 | 96 days | 100% |
| Hard freeze (28°F) | Apr 30 · May 17 · Jun 4 | Sep 8 · Sep 26 · Oct 13 | 129 days | 100% |
Planting calendar for Declo
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 | May 5 – Jul 11 |
| Tomatoes | Transplant outdoors | Jun 21 – May 24 |
| Peppers | Start seeds indoors | May 5 – Jun 5 |
| Peppers | Transplant outdoors | Jul 5 – Aug 5 |
| Eggplant | Start seeds indoors | May 22 – Jun 20 |
| Eggplant | Transplant outdoors | Jul 5 – Aug 5 |
| Cucumbers | Sow outdoors | Jul 5 – Jun 3 |
| Summer squash | Sow outdoors | Jun 21 – Aug 5 |
| Winter squash & pumpkins | Sow outdoors | Jul 5 – Aug 5 |
| Snap beans | Sow outdoors | Jun 21 – Jun 26 |
| Sweet corn | Sow outdoors | Jun 21 – May 24 |
| Watermelon & cantaloupe | Sow outdoors | Jul 5 – Aug 5 |
| Okra | Sow outdoors | Jun 28 – Jul 21 |
| Peas | Sow outdoors (spring) | May 5 – Jun 20 |
| Potatoes | Plant outdoors (spring) | May 5 – Jul 5 |
| Onions | Start seeds indoors (spring) | Mar 24 – Apr 20 |
| Onions | Transplant outdoors (spring) | May 22 – Jun 20 |
| Broccoli | Start seeds indoors (spring) | Apr 17 – May 21 |
| Broccoli | Transplant outdoors (spring) | May 22 – Jun 20 |
| Broccoli | Start seeds indoors (fall) | May 14 – May 24 |
| Broccoli | Transplant outdoors (fall) | Jun 13 – Jun 24 |
| Cabbage | Start seeds indoors (spring) | Apr 7 – May 5 |
| Cabbage | Transplant outdoors (spring) | May 5 – Jun 5 |
| Cabbage | Start seeds indoors (fall) | May 4 – Jun 3 |
| Cabbage | Transplant outdoors (fall) | Jun 3 – Jul 4 |
| Leaf lettuce | Sow outdoors (spring) | May 5 – Jul 21 |
| Leaf lettuce | Sow outdoors (fall) | Jun 3 – Jul 20 |
| Spinach | Sow outdoors (spring) | Apr 28 – Jun 11 |
| Spinach | Sow outdoors (fall) | Jun 20 – Jul 25 |
| Radishes | Sow outdoors (spring) | May 5 – Jun 25 |
| Radishes | Sow outdoors (fall) | Jun 3 – Aug 4 |
| Kale | Sow outdoors (spring) | May 22 – Jun 11 |
| Kale | Sow outdoors (fall) | May 27 – Jul 4 |
| Carrots | Sow outdoors (spring) | Jun 5 – Jul 21 |
| Carrots | Sow outdoors (fall) | May 4 – Jun 19 |
| Garlic | Plant outdoors (fall) | Sep 3 – Oct 4 |
Where these dates come from
ZIP code 83323 is matched to the NOAA station Malta, ID, 24.9 km away, at 4,521 ft elevation (26 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Malta, ID (used) | 4,521 ft | Jun 5 | Sep 13 |
| Minidoka Dam, ID | 4,164 ft | May 16 | Oct 1 |
| Burley Muni Ap, ID | 4,142 ft | May 7 | Oct 4 |
| Malta 4 Ese, ID | 4,590 ft | Jun 1 | Sep 19 |
Frost dates near Declo
- Albion, ID 83311 · last Jun 5, first Sep 13
- Rupert, ID 83350 · last May 16, first Oct 1
- Heyburn, ID 83336 · last May 7, first Oct 4
- Malta, ID 83342 · last Jun 5, first Sep 13
- Minidoka, ID 83343 · last May 16, first Oct 1
- Burley, ID 83318 · last May 7, first Oct 4
- Paul, ID 83347 · last May 6, first Oct 6
- American Falls, ID 83211 · last May 20, first Sep 26
Frequently asked questions
- When is the last frost in Declo, ID?
- For ZIP code 83323, the average last spring frost (32°F) is June 5, based on NOAA 1991-2020 climate normals for the Malta, ID weather station. There is a 1-in-10 chance of a frost after June 23.
- When is the first frost in Declo, ID?
- The average first fall frost (32°F) is September 13. There is a 1-in-10 chance of frost by August 28, so tender plants are at risk from that point on.
- How long is the growing season in 83323?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 96 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.