Frost dates for 83804Blanchard, ID
The average last spring frost in Blanchard is May 12 and the average first fall frost is September 21, giving a typical growing season of about 130 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 12
- Average first fall frost
- Sep 21
- Growing season
- 130 days
Safer after May 29 (1-in-10 risk)
Possible by Sep 5 (1-in-10 risk)
Last frost typically in 197 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) | May 14 · Jun 1 · Jun 26 | Aug 24 · Sep 6 · Sep 21 | 95 days | 100% |
| Frost / freeze (32°F) | Apr 28 · May 12 · May 29 | Sep 5 · Sep 21 · Oct 5 | 130 days | 100% |
| Hard freeze (28°F) | Apr 13 · Apr 30 · May 14 | Sep 18 · Oct 2 · Oct 26 | 157 days | 100% |
Planting calendar for Blanchard
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 11 – Jun 17 |
| Tomatoes | Transplant outdoors | May 28 – Jun 1 |
| Peppers | Start seeds indoors | Apr 11 – May 12 |
| Peppers | Transplant outdoors | Jun 11 – Jul 12 |
| Eggplant | Start seeds indoors | Apr 28 – May 27 |
| Eggplant | Transplant outdoors | Jun 11 – Jul 12 |
| Cucumbers | Sow outdoors | Jun 11 – Jun 11 |
| Summer squash | Sow outdoors | May 28 – Jul 12 |
| Winter squash & pumpkins | Sow outdoors | Jun 11 – Jul 12 |
| Snap beans | Sow outdoors | May 28 – Jul 4 |
| Sweet corn | Sow outdoors | May 28 – Jun 1 |
| Watermelon & cantaloupe | Sow outdoors | Jun 11 – Jul 12 |
| Okra | Sow outdoors | Jun 4 – Jun 27 |
| Peas | Sow outdoors (spring) | Apr 11 – May 27 |
| Potatoes | Plant outdoors (spring) | Apr 11 – Jun 11 |
| Onions | Start seeds indoors (spring) | Feb 28 – Mar 27 |
| Onions | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (spring) | Mar 24 – Apr 27 |
| Broccoli | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (fall) | May 22 – Jun 1 |
| Broccoli | Transplant outdoors (fall) | Jun 21 – Jul 2 |
| Cabbage | Start seeds indoors (spring) | Mar 14 – Apr 11 |
| Cabbage | Transplant outdoors (spring) | Apr 11 – May 12 |
| Cabbage | Start seeds indoors (fall) | May 12 – Jun 11 |
| Cabbage | Transplant outdoors (fall) | Jun 11 – Jul 12 |
| Leaf lettuce | Sow outdoors (spring) | Apr 11 – Jun 27 |
| Leaf lettuce | Sow outdoors (fall) | Jun 11 – Jul 28 |
| Spinach | Sow outdoors (spring) | Apr 4 – May 18 |
| Spinach | Sow outdoors (fall) | Jun 28 – Aug 2 |
| Radishes | Sow outdoors (spring) | Apr 11 – Jun 1 |
| Radishes | Sow outdoors (fall) | Jun 11 – Aug 12 |
| Kale | Sow outdoors (spring) | Apr 28 – May 18 |
| Kale | Sow outdoors (fall) | Jun 4 – Jul 12 |
| Carrots | Sow outdoors (spring) | May 12 – Jun 27 |
| Carrots | Sow outdoors (fall) | May 12 – Jun 27 |
| Garlic | Plant outdoors (fall) | Sep 11 – Oct 12 |
Where these dates come from
ZIP code 83804 is matched to the NOAA station Newport, WA, 18.5 km away, at 2,162 ft elevation (141 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Newport, WA (used) | 2,162 ft | May 12 | Sep 21 |
| Bayview Model Basin, ID | 2,087 ft | May 22 | Sep 22 |
| Deer Park Ap, WA | 2,191 ft | May 22 | Sep 14 |
| Priest Rvr Exp Stn, ID | 2,371 ft | May 20 | Sep 13 |
Frost dates near Blanchard
- Spirit Lake, ID 83869 · last May 22, first Sep 22
- Oldtown, ID 83822 · last May 12, first Sep 21
- Priest River, ID 83856 · last May 12, first Sep 21
- Newport, WA 99156 · last May 12, first Sep 21
- Athol, ID 83801 · last May 22, first Sep 22
- Elk, WA 99009 · last May 22, first Sep 14
- Rathdrum, ID 83858 · last Apr 22, first Oct 18
- Laclede, ID 83841 · last May 8, first Sep 28
Frequently asked questions
- When is the last frost in Blanchard, ID?
- For ZIP code 83804, the average last spring frost (32°F) is May 12, based on NOAA 1991-2020 climate normals for the Newport, WA weather station. There is a 1-in-10 chance of a frost after May 29.
- When is the first frost in Blanchard, ID?
- The average first fall frost (32°F) is September 21. There is a 1-in-10 chance of frost by September 5, so tender plants are at risk from that point on.
- How long is the growing season in 83804?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 130 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.