Frost dates for 83328Filer, ID
The average last spring frost in Filer is April 25 and the average first fall frost is October 15, giving a typical growing season of about 172 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 25
- Average first fall frost
- Oct 15
- Growing season
- 172 days
Safer after May 10 (1-in-10 risk)
Possible by Sep 29 (1-in-10 risk)
Last frost typically in 180 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 28 · May 10 · Jun 5 | Sep 17 · Oct 2 · Oct 17 | 143 days | 100% |
| Frost / freeze (32°F) | Apr 8 · Apr 25 · May 10 | Sep 29 · Oct 15 · Oct 29 | 172 days | 100% |
| Hard freeze (28°F) | Mar 13 · Apr 6 · Apr 25 | Oct 13 · Oct 26 · Nov 12 | 203 days | 100% |
Planting calendar for Filer
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 25 – May 31 |
| Tomatoes | Transplant outdoors | May 11 – Jun 25 |
| Peppers | Start seeds indoors | Mar 25 – Apr 25 |
| Peppers | Transplant outdoors | May 25 – Jun 25 |
| Eggplant | Start seeds indoors | Apr 11 – May 10 |
| Eggplant | Transplant outdoors | May 25 – Jun 25 |
| Cucumbers | Sow outdoors | May 25 – Jul 5 |
| Summer squash | Sow outdoors | May 11 – Jun 25 |
| Winter squash & pumpkins | Sow outdoors | May 25 – Jun 25 |
| Snap beans | Sow outdoors | May 11 – Jul 28 |
| Sweet corn | Sow outdoors | May 11 – Jun 25 |
| Watermelon & cantaloupe | Sow outdoors | May 25 – Jun 25 |
| Okra | Sow outdoors | May 18 – Jun 10 |
| Peas | Sow outdoors (spring) | Mar 25 – May 10 |
| Potatoes | Plant outdoors (spring) | Mar 25 – May 25 |
| Onions | Start seeds indoors (spring) | Feb 11 – Mar 10 |
| Onions | Transplant outdoors (spring) | Apr 11 – May 10 |
| Broccoli | Start seeds indoors (spring) | Mar 7 – Apr 10 |
| Broccoli | Transplant outdoors (spring) | Apr 11 – May 10 |
| Broccoli | Start seeds indoors (fall) | Jun 15 – Jun 25 |
| Broccoli | Transplant outdoors (fall) | Jul 15 – Jul 26 |
| Cabbage | Start seeds indoors (spring) | Feb 25 – Mar 25 |
| Cabbage | Transplant outdoors (spring) | Mar 25 – Apr 25 |
| Cabbage | Start seeds indoors (fall) | Jun 5 – Jul 5 |
| Cabbage | Transplant outdoors (fall) | Jul 5 – Aug 5 |
| Leaf lettuce | Sow outdoors (spring) | Mar 25 – Jun 10 |
| Leaf lettuce | Sow outdoors (fall) | Jul 5 – Aug 21 |
| Spinach | Sow outdoors (spring) | Mar 18 – May 1 |
| Spinach | Sow outdoors (fall) | Jul 22 – Aug 26 |
| Radishes | Sow outdoors (spring) | Mar 25 – May 15 |
| Radishes | Sow outdoors (fall) | Jul 5 – Sep 5 |
| Kale | Sow outdoors (spring) | Apr 11 – May 1 |
| Kale | Sow outdoors (fall) | Jun 28 – Aug 5 |
| Carrots | Sow outdoors (spring) | Apr 25 – Jun 10 |
| Carrots | Sow outdoors (fall) | Jun 5 – Jul 21 |
| Garlic | Plant outdoors (fall) | Oct 5 – Nov 5 |
Where these dates come from
ZIP code 83328 is matched to the NOAA station Buhl #2, ID, 11.4 km away, at 3,800 ft elevation (10 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Buhl #2, ID (used) | 3,800 ft | Apr 25 | Oct 15 |
| Twin Falls-Kmvt, ID | 3,670 ft | Apr 30 | Oct 9 |
| Twin Falls Sun Vly Rgnl Ap, ID | 4,151 ft | May 9 | Oct 4 |
| Jerome, ID | 3,740 ft | May 2 | Oct 14 |
Frost dates near Filer
- Twin Falls, ID 83301 · last Apr 30, first Oct 9
- Buhl, ID 83316 · last Apr 25, first Oct 15
- Jerome, ID 83338 · last May 2, first Oct 14
- Kimberly, ID 83341 · last May 6, first Oct 3
- Castleford, ID 83321 · last May 17, first Sep 29
- Wendell, ID 83355 · last May 2, first Oct 14
- Hansen, ID 83334 · last May 6, first Oct 3
- Eden, ID 83325 · last May 7, first Oct 5
Frequently asked questions
- When is the last frost in Filer, ID?
- For ZIP code 83328, the average last spring frost (32°F) is April 25, based on NOAA 1991-2020 climate normals for the Buhl #2, ID weather station. There is a 1-in-10 chance of a frost after May 10.
- When is the first frost in Filer, ID?
- The average first fall frost (32°F) is October 15. There is a 1-in-10 chance of frost by September 29, so tender plants are at risk from that point on.
- How long is the growing season in 83328?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 172 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.