Frost dates for 83639Marsing, ID
The average last spring frost in Marsing is April 24 and the average first fall frost is October 9, giving a typical growing season of about 169 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 24
- Average first fall frost
- Oct 9
- Growing season
- 169 days
Safer after May 5 (1-in-10 risk)
Possible by Sep 26 (1-in-10 risk)
Last frost typically in 173 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 22 · May 5 · May 24 | Sep 16 · Sep 28 · Oct 11 | 143 days | 100% |
| Frost / freeze (32°F) | Apr 9 · Apr 24 · May 5 | Sep 26 · Oct 9 · Oct 23 | 169 days | 100% |
| Hard freeze (28°F) | Mar 25 · Apr 10 · Apr 25 | Oct 8 · Oct 22 · Nov 4 | 194 days | 100% |
Planting calendar for Marsing
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 24 – May 30 |
| Tomatoes | Transplant outdoors | May 10 – Jun 19 |
| Peppers | Start seeds indoors | Mar 24 – Apr 24 |
| Peppers | Transplant outdoors | May 24 – Jun 24 |
| Eggplant | Start seeds indoors | Apr 10 – May 9 |
| Eggplant | Transplant outdoors | May 24 – Jun 24 |
| Cucumbers | Sow outdoors | May 24 – Jun 29 |
| Summer squash | Sow outdoors | May 10 – Jun 24 |
| Winter squash & pumpkins | Sow outdoors | May 24 – Jun 24 |
| Snap beans | Sow outdoors | May 10 – Jul 22 |
| Sweet corn | Sow outdoors | May 10 – Jun 19 |
| Watermelon & cantaloupe | Sow outdoors | May 24 – Jun 24 |
| Okra | Sow outdoors | May 17 – Jun 9 |
| Peas | Sow outdoors (spring) | Mar 24 – May 9 |
| Potatoes | Plant outdoors (spring) | Mar 24 – May 24 |
| Onions | Start seeds indoors (spring) | Feb 10 – Mar 9 |
| Onions | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (spring) | Mar 6 – Apr 9 |
| Broccoli | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (fall) | Jun 9 – Jun 19 |
| Broccoli | Transplant outdoors (fall) | Jul 9 – Jul 20 |
| Cabbage | Start seeds indoors (spring) | Feb 24 – Mar 24 |
| Cabbage | Transplant outdoors (spring) | Mar 24 – Apr 24 |
| Cabbage | Start seeds indoors (fall) | May 30 – Jun 29 |
| Cabbage | Transplant outdoors (fall) | Jun 29 – Jul 30 |
| Leaf lettuce | Sow outdoors (spring) | Mar 24 – Jun 9 |
| Leaf lettuce | Sow outdoors (fall) | Jun 29 – Aug 15 |
| Spinach | Sow outdoors (spring) | Mar 17 – Apr 30 |
| Spinach | Sow outdoors (fall) | Jul 16 – Aug 20 |
| Radishes | Sow outdoors (spring) | Mar 24 – May 14 |
| Radishes | Sow outdoors (fall) | Jun 29 – Aug 30 |
| Kale | Sow outdoors (spring) | Apr 10 – Apr 30 |
| Kale | Sow outdoors (fall) | Jun 22 – Jul 30 |
| Carrots | Sow outdoors (spring) | Apr 24 – Jun 9 |
| Carrots | Sow outdoors (fall) | May 30 – Jul 15 |
| Garlic | Plant outdoors (fall) | Sep 29 – Oct 30 |
Where these dates come from
ZIP code 83639 is matched to the NOAA station Homedale 1 Se, ID, 10.7 km away, at 2,230 ft elevation (73 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Homedale 1 Se, ID (used) | 2,230 ft | Apr 24 | Oct 9 |
| Deer Flat Dam, ID | 2,510 ft | Apr 23 | Oct 18 |
| Nampa Sugar Factory, ID | 2,470 ft | Apr 29 | Oct 13 |
| Rockville 5 N, OR | 3,670 ft | May 29 | Sep 14 |
Frost dates near Marsing
- Huston, ID 83630 · last Apr 23, first Oct 18
- Nampa, ID 83653 · last Apr 23, first Oct 18
- Caldwell, ID 83607 · last Apr 23, first Oct 18
- Homedale, ID 83628 · last Apr 24, first Oct 9
- Greenleaf, ID 83626 · last Apr 23, first Oct 18
- Wilder, ID 83676 · last Apr 24, first Oct 9
- Notus, ID 83656 · last Apr 27, first Oct 9
- Adrian, OR 97901 · last Apr 24, first Oct 9
Frequently asked questions
- When is the last frost in Marsing, ID?
- For ZIP code 83639, the average last spring frost (32°F) is April 24, based on NOAA 1991-2020 climate normals for the Homedale 1 Se, ID weather station. There is a 1-in-10 chance of a frost after May 5.
- When is the first frost in Marsing, ID?
- The average first fall frost (32°F) is October 9. There is a 1-in-10 chance of frost by September 26, so tender plants are at risk from that point on.
- How long is the growing season in 83639?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 169 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.