Frost dates for 83467Salmon, ID
The average last spring frost in Salmon is May 17 and the average first fall frost is September 24, giving a typical growing season of about 127 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 17
- Average first fall frost
- Sep 24
- Growing season
- 127 days
Safer after Jun 9 (1-in-10 risk)
Possible by Sep 9 (1-in-10 risk)
Last frost typically in 201 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 20 · Jun 7 · Jun 23 | Aug 31 · Sep 13 · Sep 24 | 95 days | 100% |
| Frost / freeze (32°F) | May 3 · May 17 · Jun 9 | Sep 9 · Sep 24 · Oct 5 | 127 days | 100% |
| Hard freeze (28°F) | Apr 19 · May 2 · May 19 | Sep 21 · Oct 5 · Oct 18 | 153 days | 100% |
Planting calendar for Salmon
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 16 – Jun 22 |
| Tomatoes | Transplant outdoors | Jun 2 – Jun 4 |
| Peppers | Start seeds indoors | Apr 16 – May 17 |
| Peppers | Transplant outdoors | Jun 16 – Jul 17 |
| Eggplant | Start seeds indoors | May 3 – Jun 1 |
| Eggplant | Transplant outdoors | Jun 16 – Jul 17 |
| Cucumbers | Sow outdoors | Jun 16 – Jun 14 |
| Summer squash | Sow outdoors | Jun 2 – Jul 17 |
| Winter squash & pumpkins | Sow outdoors | Jun 16 – Jul 17 |
| Snap beans | Sow outdoors | Jun 2 – Jul 7 |
| Sweet corn | Sow outdoors | Jun 2 – Jun 4 |
| Watermelon & cantaloupe | Sow outdoors | Jun 16 – Jul 17 |
| Okra | Sow outdoors | Jun 9 – Jul 2 |
| Peas | Sow outdoors (spring) | Apr 16 – Jun 1 |
| Potatoes | Plant outdoors (spring) | Apr 16 – Jun 16 |
| Onions | Start seeds indoors (spring) | Mar 5 – Apr 1 |
| Onions | Transplant outdoors (spring) | May 3 – Jun 1 |
| Broccoli | Start seeds indoors (spring) | Mar 29 – May 2 |
| Broccoli | Transplant outdoors (spring) | May 3 – Jun 1 |
| Broccoli | Start seeds indoors (fall) | May 25 – Jun 4 |
| Broccoli | Transplant outdoors (fall) | Jun 24 – Jul 5 |
| Cabbage | Start seeds indoors (spring) | Mar 19 – Apr 16 |
| Cabbage | Transplant outdoors (spring) | Apr 16 – May 17 |
| Cabbage | Start seeds indoors (fall) | May 15 – Jun 14 |
| Cabbage | Transplant outdoors (fall) | Jun 14 – Jul 15 |
| Leaf lettuce | Sow outdoors (spring) | Apr 16 – Jul 2 |
| Leaf lettuce | Sow outdoors (fall) | Jun 14 – Jul 31 |
| Spinach | Sow outdoors (spring) | Apr 9 – May 23 |
| Spinach | Sow outdoors (fall) | Jul 1 – Aug 5 |
| Radishes | Sow outdoors (spring) | Apr 16 – Jun 6 |
| Radishes | Sow outdoors (fall) | Jun 14 – Aug 15 |
| Kale | Sow outdoors (spring) | May 3 – May 23 |
| Kale | Sow outdoors (fall) | Jun 7 – Jul 15 |
| Carrots | Sow outdoors (spring) | May 17 – Jul 2 |
| Carrots | Sow outdoors (fall) | May 15 – Jun 30 |
| Garlic | Plant outdoors (fall) | Sep 14 – Oct 15 |
Where these dates come from
ZIP code 83467 is matched to the NOAA station Salmon-Ksra, ID, 1.9 km away, at 3,953 ft elevation (82 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Salmon-Ksra, ID (used) | 3,953 ft | May 17 | Sep 24 |
| Shoup, ID | 3,400 ft | May 3 | Oct 8 |
| Gibbonsville #2, ID | 4,480 ft | Jun 1 | Sep 17 |
| Jackson, MT | 6,480 ft | — | — |
Frost dates near Salmon
- Carmen, ID 83462 · last May 17, first Sep 24
- Tendoy, ID 83468 · last —, first —
- Cobalt, ID 83229 · last May 14, first Sep 25
- North Fork, ID 83466 · last —, first —
- Lemhi, ID 83465 · last Jun 12, first Sep 6
- Shoup, ID 83469 · last May 3, first Oct 8
- Gibbonsville, ID 83463 · last —, first —
- Jackson, MT 59736 · last —, first —
Frequently asked questions
- When is the last frost in Salmon, ID?
- For ZIP code 83467, the average last spring frost (32°F) is May 17, based on NOAA 1991-2020 climate normals for the Salmon-Ksra, ID weather station. There is a 1-in-10 chance of a frost after June 9.
- When is the first frost in Salmon, ID?
- The average first fall frost (32°F) is September 24. There is a 1-in-10 chance of frost by September 9, so tender plants are at risk from that point on.
- How long is the growing season in 83467?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 127 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.