Frost dates for 83650Murphy, ID
The average last spring frost in Murphy is May 31 and the average first fall frost is October 6, giving a typical growing season of about 128 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 31
- Average first fall frost
- Oct 6
- Growing season
- 128 days
Safer after Jun 17 (1-in-10 risk)
Possible by Sep 10 (1-in-10 risk)
Last frost typically in 210 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 22 · Jun 12 · Jun 28 | Sep 3 · Sep 26 · Oct 12 | 105 days | 100% |
| Frost / freeze (32°F) | May 4 · May 31 · Jun 17 | Sep 10 · Oct 6 · Oct 25 | 128 days | 100% |
| Hard freeze (28°F) | Apr 21 · May 9 · Jun 4 | Sep 29 · Oct 19 · Nov 6 | 160 days | 100% |
Planting calendar for Murphy
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 30 – Jul 6 |
| Tomatoes | Transplant outdoors | Jun 16 – Jun 16 |
| Peppers | Start seeds indoors | Apr 30 – May 31 |
| Peppers | Transplant outdoors | Jun 30 – Jul 31 |
| Eggplant | Start seeds indoors | May 17 – Jun 15 |
| Eggplant | Transplant outdoors | Jun 30 – Jul 31 |
| Cucumbers | Sow outdoors | Jun 30 – Jun 26 |
| Summer squash | Sow outdoors | Jun 16 – Jul 31 |
| Winter squash & pumpkins | Sow outdoors | Jun 30 – Jul 31 |
| Snap beans | Sow outdoors | Jun 16 – Jul 19 |
| Sweet corn | Sow outdoors | Jun 16 – Jun 16 |
| Watermelon & cantaloupe | Sow outdoors | Jun 30 – Jul 31 |
| Okra | Sow outdoors | Jun 23 – Jul 16 |
| Peas | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Potatoes | Plant outdoors (spring) | Apr 30 – Jun 30 |
| Onions | Start seeds indoors (spring) | Mar 19 – Apr 15 |
| Onions | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (spring) | Apr 12 – May 16 |
| Broccoli | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (fall) | Jun 6 – Jun 16 |
| Broccoli | Transplant outdoors (fall) | Jul 6 – Jul 17 |
| Cabbage | Start seeds indoors (spring) | Apr 2 – Apr 30 |
| Cabbage | Transplant outdoors (spring) | Apr 30 – May 31 |
| Cabbage | Start seeds indoors (fall) | May 27 – Jun 26 |
| Cabbage | Transplant outdoors (fall) | Jun 26 – Jul 27 |
| Leaf lettuce | Sow outdoors (spring) | Apr 30 – Jul 16 |
| Leaf lettuce | Sow outdoors (fall) | Jun 26 – Aug 12 |
| Spinach | Sow outdoors (spring) | Apr 23 – Jun 6 |
| Spinach | Sow outdoors (fall) | Jul 13 – Aug 17 |
| Radishes | Sow outdoors (spring) | Apr 30 – Jun 20 |
| Radishes | Sow outdoors (fall) | Jun 26 – Aug 27 |
| Kale | Sow outdoors (spring) | May 17 – Jun 6 |
| Kale | Sow outdoors (fall) | Jun 19 – Jul 27 |
| Carrots | Sow outdoors (spring) | May 31 – Jul 16 |
| Carrots | Sow outdoors (fall) | May 27 – Jul 12 |
| Garlic | Plant outdoors (fall) | Sep 26 – Oct 27 |
Where these dates come from
ZIP code 83650 is matched to the NOAA station Silver City 5 W, ID, 23.3 km away, at 6,160 ft elevation (950 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Silver City 5 W, ID (used) | 6,160 ft | May 31 | Oct 6 |
| Murphy 10 W, ID | 3,950 ft | May 17 | Sep 30 |
| Reynolds, ID | 3,930 ft | May 21 | Sep 28 |
| Grand View 4 Nw, ID | 2,400 ft | Apr 28 | Oct 6 |
Frost dates near Murphy
- Grand View, ID 83624 · last Apr 28, first Oct 6
- Jordan Valley, OR 97910 · last May 22, first Sep 28
- Melba, ID 83641 · last Apr 29, first Oct 13
- Bruneau, ID 83604 · last May 17, first Sep 29
- Arock, OR 97902 · last Jun 11, first Sep 10
- Kuna, ID 83634 · last Apr 24, first Oct 21
- Boise, ID 83708 · last Apr 24, first Oct 21
- Nampa, ID 83686 · last Apr 29, first Oct 13
Frequently asked questions
- When is the last frost in Murphy, ID?
- For ZIP code 83650, the average last spring frost (32°F) is May 31, based on NOAA 1991-2020 climate normals for the Silver City 5 W, ID weather station. There is a 1-in-10 chance of a frost after June 17.
- When is the first frost in Murphy, ID?
- The average first fall frost (32°F) is October 6. There is a 1-in-10 chance of frost by September 10, so tender plants are at risk from that point on.
- How long is the growing season in 83650?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 128 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.