Frost dates for 83327Fairfield, ID
The average last spring frost in Fairfield is June 8 and the average first fall frost is September 14, giving a typical growing season of about 97 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 8
- Average first fall frost
- Sep 14
- Growing season
- 97 days
Safer after Jun 28 (1-in-10 risk)
Possible by Aug 29 (1-in-10 risk)
Last frost typically in 218 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 15 · Jun 8 · Jun 28 | Aug 29 · Sep 14 · Sep 28 | 97 days | 100% |
| Hard freeze (28°F) | Apr 24 · May 11 · Jun 7 | Sep 9 · Sep 28 · Oct 11 | 134 days | 100% |
Planting calendar for Fairfield
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 8 – Jul 14 |
| Tomatoes | Transplant outdoors | Jun 24 – May 25 |
| Peppers | Start seeds indoors | May 8 – Jun 8 |
| Peppers | Transplant outdoors | Jul 8 – Aug 8 |
| Eggplant | Start seeds indoors | May 25 – Jun 23 |
| Eggplant | Transplant outdoors | Jul 8 – Aug 8 |
| Cucumbers | Sow outdoors | Jul 8 – Jun 4 |
| Summer squash | Sow outdoors | Jun 24 – Aug 8 |
| Winter squash & pumpkins | Sow outdoors | Jul 8 – Aug 8 |
| Snap beans | Sow outdoors | Jun 24 – Jun 27 |
| Sweet corn | Sow outdoors | Jun 24 – May 25 |
| Watermelon & cantaloupe | Sow outdoors | Jul 8 – Aug 8 |
| Okra | Sow outdoors | Jul 1 – Jul 24 |
| Peas | Sow outdoors (spring) | May 8 – Jun 23 |
| Potatoes | Plant outdoors (spring) | May 8 – Jul 8 |
| Onions | Start seeds indoors (spring) | Mar 27 – Apr 23 |
| Onions | Transplant outdoors (spring) | May 25 – Jun 23 |
| Broccoli | Start seeds indoors (spring) | Apr 20 – May 24 |
| Broccoli | Transplant outdoors (spring) | May 25 – Jun 23 |
| Broccoli | Start seeds indoors (fall) | May 15 – May 25 |
| Broccoli | Transplant outdoors (fall) | Jun 14 – Jun 25 |
| Cabbage | Start seeds indoors (spring) | Apr 10 – May 8 |
| Cabbage | Transplant outdoors (spring) | May 8 – Jun 8 |
| Cabbage | Start seeds indoors (fall) | May 5 – Jun 4 |
| Cabbage | Transplant outdoors (fall) | Jun 4 – Jul 5 |
| Leaf lettuce | Sow outdoors (spring) | May 8 – Jul 24 |
| Leaf lettuce | Sow outdoors (fall) | Jun 4 – Jul 21 |
| Spinach | Sow outdoors (spring) | May 1 – Jun 14 |
| Spinach | Sow outdoors (fall) | Jun 21 – Jul 26 |
| Radishes | Sow outdoors (spring) | May 8 – Jun 28 |
| Radishes | Sow outdoors (fall) | Jun 4 – Aug 5 |
| Kale | Sow outdoors (spring) | May 25 – Jun 14 |
| Kale | Sow outdoors (fall) | May 28 – Jul 5 |
| Carrots | Sow outdoors (spring) | Jun 8 – Jul 24 |
| Carrots | Sow outdoors (fall) | May 5 – Jun 20 |
| Garlic | Plant outdoors (fall) | Sep 4 – Oct 5 |
Where these dates come from
ZIP code 83327 is matched to the NOAA station Fairfield Rs, ID, 2.7 km away, at 5,065 ft elevation (43 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Fairfield Rs, ID (used) | 5,065 ft | Jun 8 | Sep 14 |
| Hill City 1 W, ID | 5,100 ft | Jun 16 | Sep 6 |
| Bellevue, ID | 5,192 ft | May 13 | Oct 2 |
| Ketchum Rs, ID | 5,890 ft | — | — |
Frost dates near Fairfield
- Corral, ID 83322 · last —, first —
- Hill City, ID 83337 · last Jun 16, first Sep 6
- Ketchum, ID 83340 · last —, first —
- Hailey, ID 83333 · last May 13, first Oct 2
- Bellevue, ID 83313 · last May 13, first Oct 2
- Sun Valley, ID 83354 · last —, first —
- Bliss, ID 83314 · last May 3, first Oct 1
- Gooding, ID 83330 · last May 2, first Oct 14
Frequently asked questions
- When is the last frost in Fairfield, ID?
- For ZIP code 83327, the average last spring frost (32°F) is June 8, based on NOAA 1991-2020 climate normals for the Fairfield Rs, ID weather station. There is a 1-in-10 chance of a frost after June 28.
- When is the first frost in Fairfield, ID?
- The average first fall frost (32°F) is September 14. There is a 1-in-10 chance of frost by August 29, so tender plants are at risk from that point on.
- How long is the growing season in 83327?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 97 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.