Frost dates for 83630Huston, ID
The average last spring frost in Huston is April 23 and the average first fall frost is October 18, giving a typical growing season of about 178 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 23
- Average first fall frost
- Oct 18
- Growing season
- 178 days
Safer after May 9 (1-in-10 risk)
Possible by Oct 2 (1-in-10 risk)
Last frost typically in 172 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 24 · May 7 · May 28 | Sep 17 · Oct 4 · Oct 18 | 148 days | 100% |
| Frost / freeze (32°F) | Apr 5 · Apr 23 · May 9 | Oct 2 · Oct 18 · Nov 1 | 178 days | 100% |
| Hard freeze (28°F) | Mar 15 · Apr 5 · Apr 25 | Oct 17 · Oct 30 · Nov 15 | 207 days | 100% |
Planting calendar for Huston
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 23 – May 29 |
| Tomatoes | Transplant outdoors | May 9 – Jun 28 |
| Peppers | Start seeds indoors | Mar 23 – Apr 23 |
| Peppers | Transplant outdoors | May 23 – Jun 23 |
| Eggplant | Start seeds indoors | Apr 9 – May 8 |
| Eggplant | Transplant outdoors | May 23 – Jun 23 |
| Cucumbers | Sow outdoors | May 23 – Jul 8 |
| Summer squash | Sow outdoors | May 9 – Jun 23 |
| Winter squash & pumpkins | Sow outdoors | May 23 – Jun 23 |
| Snap beans | Sow outdoors | May 9 – Jul 31 |
| Sweet corn | Sow outdoors | May 9 – Jun 28 |
| Watermelon & cantaloupe | Sow outdoors | May 23 – Jun 23 |
| Okra | Sow outdoors | May 16 – Jun 8 |
| Peas | Sow outdoors (spring) | Mar 23 – May 8 |
| Potatoes | Plant outdoors (spring) | Mar 23 – May 23 |
| Onions | Start seeds indoors (spring) | Feb 9 – Mar 8 |
| Onions | Transplant outdoors (spring) | Apr 9 – May 8 |
| Broccoli | Start seeds indoors (spring) | Mar 5 – Apr 8 |
| Broccoli | Transplant outdoors (spring) | Apr 9 – May 8 |
| Broccoli | Start seeds indoors (fall) | Jun 18 – Jun 28 |
| Broccoli | Transplant outdoors (fall) | Jul 18 – Jul 29 |
| Cabbage | Start seeds indoors (spring) | Feb 23 – Mar 23 |
| Cabbage | Transplant outdoors (spring) | Mar 23 – Apr 23 |
| Cabbage | Start seeds indoors (fall) | Jun 8 – Jul 8 |
| Cabbage | Transplant outdoors (fall) | Jul 8 – Aug 8 |
| Leaf lettuce | Sow outdoors (spring) | Mar 23 – Jun 8 |
| Leaf lettuce | Sow outdoors (fall) | Jul 8 – Aug 24 |
| Spinach | Sow outdoors (spring) | Mar 16 – Apr 29 |
| Spinach | Sow outdoors (fall) | Jul 25 – Aug 29 |
| Radishes | Sow outdoors (spring) | Mar 23 – May 13 |
| Radishes | Sow outdoors (fall) | Jul 8 – Sep 8 |
| Kale | Sow outdoors (spring) | Apr 9 – Apr 29 |
| Kale | Sow outdoors (fall) | Jul 1 – Aug 8 |
| Carrots | Sow outdoors (spring) | Apr 23 – Jun 8 |
| Carrots | Sow outdoors (fall) | Jun 8 – Jul 24 |
| Garlic | Plant outdoors (fall) | Oct 8 – Nov 8 |
Where these dates come from
ZIP code 83630 is matched to the NOAA station Deer Flat Dam, ID, 4.5 km away, at 2,510 ft elevation (52 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Deer Flat Dam, ID (used) | 2,510 ft | Apr 23 | Oct 18 |
| Homedale 1 Se, ID | 2,230 ft | Apr 24 | Oct 9 |
| Nampa Sugar Factory, ID | 2,470 ft | Apr 29 | Oct 13 |
| Parma Exp Stn, ID | 2,290 ft | Apr 27 | Oct 9 |
Frost dates near Huston
- Nampa, ID 83653 · last Apr 23, first Oct 18
- Caldwell, ID 83607 · last Apr 23, first Oct 18
- Marsing, ID 83639 · last Apr 24, first Oct 9
- Greenleaf, ID 83626 · last Apr 23, first Oct 18
- Wilder, ID 83676 · last Apr 24, first Oct 9
- Homedale, ID 83628 · last Apr 24, first Oct 9
- Notus, ID 83656 · last Apr 27, first Oct 9
- Middleton, ID 83644 · last Apr 29, first Oct 13
Frequently asked questions
- When is the last frost in Huston, ID?
- For ZIP code 83630, the average last spring frost (32°F) is April 23, based on NOAA 1991-2020 climate normals for the Deer Flat Dam, ID weather station. There is a 1-in-10 chance of a frost after May 9.
- When is the first frost in Huston, ID?
- The average first fall frost (32°F) is October 18. There is a 1-in-10 chance of frost by October 2, so tender plants are at risk from that point on.
- How long is the growing season in 83630?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 178 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.