Frost dates for 83657Ola, ID
The average last spring frost in Ola is May 31 and the average first fall frost is September 16, giving a typical growing season of about 108 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 31
- Average first fall frost
- Sep 16
- Growing season
- 108 days
Safer after Jun 19 (1-in-10 risk)
Possible by Sep 2 (1-in-10 risk)
Last frost typically in 209 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) | Jun 1 · Jun 18 · Jul 4 | Aug 19 · Sep 4 · Sep 18 | 77 days | 100% |
| Frost / freeze (32°F) | May 8 · May 31 · Jun 19 | Sep 2 · Sep 16 · Sep 30 | 108 days | 100% |
| Hard freeze (28°F) | Apr 23 · May 7 · May 30 | Sep 14 · Sep 29 · Oct 13 | 142 days | 100% |
Planting calendar for Ola
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 30 – Jul 6 |
| Tomatoes | Transplant outdoors | Jun 16 – May 27 |
| Peppers | Start seeds indoors | Apr 30 – May 31 |
| Peppers | Transplant outdoors | Jun 30 – Jul 31 |
| Eggplant | Start seeds indoors | May 17 – Jun 15 |
| Eggplant | Transplant outdoors | Jun 30 – Jul 31 |
| Cucumbers | Sow outdoors | Jun 30 – Jun 6 |
| Summer squash | Sow outdoors | Jun 16 – Jul 31 |
| Winter squash & pumpkins | Sow outdoors | Jun 30 – Jul 31 |
| Snap beans | Sow outdoors | Jun 16 – Jun 29 |
| Sweet corn | Sow outdoors | Jun 16 – May 27 |
| Watermelon & cantaloupe | Sow outdoors | Jun 30 – Jul 31 |
| Okra | Sow outdoors | Jun 23 – Jul 16 |
| Peas | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Potatoes | Plant outdoors (spring) | Apr 30 – Jun 30 |
| Onions | Start seeds indoors (spring) | Mar 19 – Apr 15 |
| Onions | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (spring) | Apr 12 – May 16 |
| Broccoli | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (fall) | May 17 – May 27 |
| Broccoli | Transplant outdoors (fall) | Jun 16 – Jun 27 |
| Cabbage | Start seeds indoors (spring) | Apr 2 – Apr 30 |
| Cabbage | Transplant outdoors (spring) | Apr 30 – May 31 |
| Cabbage | Start seeds indoors (fall) | May 7 – Jun 6 |
| Cabbage | Transplant outdoors (fall) | Jun 6 – Jul 7 |
| Leaf lettuce | Sow outdoors (spring) | Apr 30 – Jul 16 |
| Leaf lettuce | Sow outdoors (fall) | Jun 6 – Jul 23 |
| Spinach | Sow outdoors (spring) | Apr 23 – Jun 6 |
| Spinach | Sow outdoors (fall) | Jun 23 – Jul 28 |
| Radishes | Sow outdoors (spring) | Apr 30 – Jun 20 |
| Radishes | Sow outdoors (fall) | Jun 6 – Aug 7 |
| Kale | Sow outdoors (spring) | May 17 – Jun 6 |
| Kale | Sow outdoors (fall) | May 30 – Jul 7 |
| Carrots | Sow outdoors (spring) | May 31 – Jul 16 |
| Carrots | Sow outdoors (fall) | May 7 – Jun 22 |
| Garlic | Plant outdoors (fall) | Sep 6 – Oct 7 |
Where these dates come from
ZIP code 83657 is matched to the NOAA station Ola, ID, 7.4 km away, at 3,075 ft elevation (655 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ola, ID (used) | 3,075 ft | May 31 | Sep 16 |
| Garden Valley, ID | 3,100 ft | Jun 1 | Sep 10 |
| Cascade 1 Nw, ID | 4,896 ft | May 30 | Sep 19 |
| Emmett 2 E, ID | 2,390 ft | Apr 30 | Oct 17 |
Frost dates near Ola
- Banks, ID 83602 · last Jun 1, first Sep 10
- Sweet, ID 83670 · last Apr 30, first Oct 17
- Horseshoe Bend, ID 83629 · last Apr 30, first Oct 17
- Indian Valley, ID 83632 · last May 15, first Sep 27
- Placerville, ID 83666 · last Jun 17, first Sep 5
- Garden Valley, ID 83622 · last Jun 17, first Sep 5
- Midvale, ID 83645 · last May 15, first Sep 27
- Emmett, ID 83617 · last Apr 30, first Oct 17
Frequently asked questions
- When is the last frost in Ola, ID?
- For ZIP code 83657, the average last spring frost (32°F) is May 31, based on NOAA 1991-2020 climate normals for the Ola, ID weather station. There is a 1-in-10 chance of a frost after June 19.
- When is the first frost in Ola, ID?
- The average first fall frost (32°F) is September 16. There is a 1-in-10 chance of frost by September 2, so tender plants are at risk from that point on.
- How long is the growing season in 83657?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 108 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.