Frost dates for 83847Naples, ID
The average last spring frost in Naples is April 30 and the average first fall frost is October 4, giving a typical growing season of about 154 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 30
- Average first fall frost
- Oct 4
- Growing season
- 154 days
Safer after May 16 (1-in-10 risk)
Possible by Sep 18 (1-in-10 risk)
Last frost typically in 183 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 1 · May 18 · Jun 8 | Sep 5 · Sep 22 · Oct 6 | 124 days | 100% |
| Frost / freeze (32°F) | Apr 16 · Apr 30 · May 16 | Sep 18 · Oct 4 · Oct 19 | 154 days | 100% |
| Hard freeze (28°F) | Mar 26 · Apr 10 · Apr 30 | Sep 28 · Oct 16 · Nov 5 | 186 days | 100% |
Planting calendar for Naples
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 30 – Jun 5 |
| Tomatoes | Transplant outdoors | May 16 – Jun 14 |
| Peppers | Start seeds indoors | Mar 30 – Apr 30 |
| Peppers | Transplant outdoors | May 30 – Jun 30 |
| Eggplant | Start seeds indoors | Apr 16 – May 15 |
| Eggplant | Transplant outdoors | May 30 – Jun 30 |
| Cucumbers | Sow outdoors | May 30 – Jun 24 |
| Summer squash | Sow outdoors | May 16 – Jun 30 |
| Winter squash & pumpkins | Sow outdoors | May 30 – Jun 30 |
| Snap beans | Sow outdoors | May 16 – Jul 17 |
| Sweet corn | Sow outdoors | May 16 – Jun 14 |
| Watermelon & cantaloupe | Sow outdoors | May 30 – Jun 30 |
| Okra | Sow outdoors | May 23 – Jun 15 |
| Peas | Sow outdoors (spring) | Mar 30 – May 15 |
| Potatoes | Plant outdoors (spring) | Mar 30 – May 30 |
| Onions | Start seeds indoors (spring) | Feb 16 – Mar 15 |
| Onions | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (spring) | Mar 12 – Apr 15 |
| Broccoli | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (fall) | Jun 4 – Jun 14 |
| Broccoli | Transplant outdoors (fall) | Jul 4 – Jul 15 |
| Cabbage | Start seeds indoors (spring) | Mar 2 – Mar 30 |
| Cabbage | Transplant outdoors (spring) | Mar 30 – Apr 30 |
| Cabbage | Start seeds indoors (fall) | May 25 – Jun 24 |
| Cabbage | Transplant outdoors (fall) | Jun 24 – Jul 25 |
| Leaf lettuce | Sow outdoors (spring) | Mar 30 – Jun 15 |
| Leaf lettuce | Sow outdoors (fall) | Jun 24 – Aug 10 |
| Spinach | Sow outdoors (spring) | Mar 23 – May 6 |
| Spinach | Sow outdoors (fall) | Jul 11 – Aug 15 |
| Radishes | Sow outdoors (spring) | Mar 30 – May 20 |
| Radishes | Sow outdoors (fall) | Jun 24 – Aug 25 |
| Kale | Sow outdoors (spring) | Apr 16 – May 6 |
| Kale | Sow outdoors (fall) | Jun 17 – Jul 25 |
| Carrots | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Carrots | Sow outdoors (fall) | May 25 – Jul 10 |
| Garlic | Plant outdoors (fall) | Sep 24 – Oct 25 |
Where these dates come from
ZIP code 83847 is matched to the NOAA station Bonners Ferry, ID, 9.8 km away, at 2,075 ft elevation (1,199 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Bonners Ferry, ID (used) | 2,075 ft | Apr 30 | Oct 4 |
| Troy, MT | 1,929 ft | May 14 | Sep 25 |
| Sandpoint Exp Stn, ID | 2,126 ft | May 8 | Sep 28 |
| Porthill 1 Sw, ID | 1,799 ft | May 4 | Sep 30 |
Frost dates near Naples
- Bonners Ferry, ID 83805 · last Apr 30, first Oct 4
- Moyie Springs, ID 83845 · last Apr 30, first Oct 4
- Colburn, ID 83865 · last May 20, first Sep 13
- Troy, MT 59935 · last May 14, first Sep 25
- Kootenai, ID 83840 · last May 8, first Sep 28
- Sandpoint, ID 83864 · last May 8, first Sep 28
- Ponderay, ID 83852 · last May 8, first Sep 28
- Coolin, ID 83821 · last May 20, first Sep 13
Frequently asked questions
- When is the last frost in Naples, ID?
- For ZIP code 83847, the average last spring frost (32°F) is April 30, based on NOAA 1991-2020 climate normals for the Bonners Ferry, ID weather station. There is a 1-in-10 chance of a frost after May 16.
- When is the first frost in Naples, ID?
- The average first fall frost (32°F) is October 4. There is a 1-in-10 chance of frost by September 18, so tender plants are at risk from that point on.
- How long is the growing season in 83847?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 154 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.