Frost dates for 83336Heyburn, ID
The average last spring frost in Heyburn is May 7 and the average first fall frost is October 4, giving a typical growing season of about 150 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 7
- Average first fall frost
- Oct 4
- Growing season
- 150 days
Safer after May 23 (1-in-10 risk)
Possible by Sep 21 (1-in-10 risk)
Last frost typically in 188 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) | May 8 · May 24 · Jun 12 | Sep 5 · Sep 21 · Oct 5 | 119 days | 100% |
| Frost / freeze (32°F) | Apr 23 · May 7 · May 23 | Sep 21 · Oct 4 · Oct 18 | 150 days | 100% |
| Hard freeze (28°F) | Apr 6 · Apr 21 · May 5 | Oct 1 · Oct 17 · Nov 1 | 176 days | 100% |
Planting calendar for Heyburn
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 | Apr 6 – Jun 12 |
| Tomatoes | Transplant outdoors | May 23 – Jun 14 |
| Peppers | Start seeds indoors | Apr 6 – May 7 |
| Peppers | Transplant outdoors | Jun 6 – Jul 7 |
| Eggplant | Start seeds indoors | Apr 23 – May 22 |
| Eggplant | Transplant outdoors | Jun 6 – Jul 7 |
| Cucumbers | Sow outdoors | Jun 6 – Jun 24 |
| Summer squash | Sow outdoors | May 23 – Jul 7 |
| Winter squash & pumpkins | Sow outdoors | Jun 6 – Jul 7 |
| Snap beans | Sow outdoors | May 23 – Jul 17 |
| Sweet corn | Sow outdoors | May 23 – Jun 14 |
| Watermelon & cantaloupe | Sow outdoors | Jun 6 – Jul 7 |
| Okra | Sow outdoors | May 30 – Jun 22 |
| Peas | Sow outdoors (spring) | Apr 6 – May 22 |
| Potatoes | Plant outdoors (spring) | Apr 6 – Jun 6 |
| Onions | Start seeds indoors (spring) | Feb 23 – Mar 22 |
| Onions | Transplant outdoors (spring) | Apr 23 – May 22 |
| Broccoli | Start seeds indoors (spring) | Mar 19 – Apr 22 |
| Broccoli | Transplant outdoors (spring) | Apr 23 – May 22 |
| Broccoli | Start seeds indoors (fall) | Jun 4 – Jun 14 |
| Broccoli | Transplant outdoors (fall) | Jul 4 – Jul 15 |
| Cabbage | Start seeds indoors (spring) | Mar 9 – Apr 6 |
| Cabbage | Transplant outdoors (spring) | Apr 6 – May 7 |
| Cabbage | Start seeds indoors (fall) | May 25 – Jun 24 |
| Cabbage | Transplant outdoors (fall) | Jun 24 – Jul 25 |
| Leaf lettuce | Sow outdoors (spring) | Apr 6 – Jun 22 |
| Leaf lettuce | Sow outdoors (fall) | Jun 24 – Aug 10 |
| Spinach | Sow outdoors (spring) | Mar 30 – May 13 |
| Spinach | Sow outdoors (fall) | Jul 11 – Aug 15 |
| Radishes | Sow outdoors (spring) | Apr 6 – May 27 |
| Radishes | Sow outdoors (fall) | Jun 24 – Aug 25 |
| Kale | Sow outdoors (spring) | Apr 23 – May 13 |
| Kale | Sow outdoors (fall) | Jun 17 – Jul 25 |
| Carrots | Sow outdoors (spring) | May 7 – Jun 22 |
| Carrots | Sow outdoors (fall) | May 25 – Jul 10 |
| Garlic | Plant outdoors (fall) | Sep 24 – Oct 25 |
Where these dates come from
ZIP code 83336 is matched to the NOAA station Burley Muni Ap, ID, 2.1 km away, at 4,142 ft elevation (11 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Burley Muni Ap, ID (used) | 4,142 ft | May 7 | Oct 4 |
| Paul 1Ene, ID | 4,150 ft | May 6 | Oct 6 |
| Minidoka Dam, ID | 4,164 ft | May 16 | Oct 1 |
| Hazelton, ID | 4,060 ft | May 7 | Oct 5 |
Frost dates near Heyburn
- Burley, ID 83318 · last May 7, first Oct 4
- Paul, ID 83347 · last May 6, first Oct 6
- Rupert, ID 83350 · last May 16, first Oct 1
- Albion, ID 83311 · last Jun 5, first Sep 13
- Declo, ID 83323 · last Jun 5, first Sep 13
- Hazelton, ID 83335 · last May 7, first Oct 5
- Minidoka, ID 83343 · last May 16, first Oct 1
- Murtaugh, ID 83344 · last May 7, first Oct 5
Frequently asked questions
- When is the last frost in Heyburn, ID?
- For ZIP code 83336, the average last spring frost (32°F) is May 7, based on NOAA 1991-2020 climate normals for the Burley Muni Ap, ID weather station. There is a 1-in-10 chance of a frost after May 23.
- When is the first frost in Heyburn, ID?
- The average first fall frost (32°F) is October 4. There is a 1-in-10 chance of frost by September 21, so tender plants are at risk from that point on.
- How long is the growing season in 83336?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 150 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.