Frost dates for 83212Arbon, ID
The average last spring frost in Arbon is May 23 and the average first fall frost is September 24, giving a typical growing season of about 121 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 23
- Average first fall frost
- Sep 24
- Growing season
- 121 days
Safer after Jun 10 (1-in-10 risk)
Possible by Sep 7 (1-in-10 risk)
Last frost typically in 208 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 24 · Jun 11 · Jun 28 | Aug 28 · Sep 11 · Sep 25 | 89 days | 100% |
| Frost / freeze (32°F) | May 6 · May 23 · Jun 10 | Sep 7 · Sep 24 · Oct 7 | 121 days | 100% |
| Hard freeze (28°F) | Apr 20 · May 4 · May 21 | Sep 20 · Oct 4 · Oct 19 | 152 days | 100% |
Planting calendar for Arbon
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 22 – Jun 28 |
| Tomatoes | Transplant outdoors | Jun 8 – Jun 4 |
| Peppers | Start seeds indoors | Apr 22 – May 23 |
| Peppers | Transplant outdoors | Jun 22 – Jul 23 |
| Eggplant | Start seeds indoors | May 9 – Jun 7 |
| Eggplant | Transplant outdoors | Jun 22 – Jul 23 |
| Cucumbers | Sow outdoors | Jun 22 – Jun 14 |
| Summer squash | Sow outdoors | Jun 8 – Jul 23 |
| Winter squash & pumpkins | Sow outdoors | Jun 22 – Jul 23 |
| Snap beans | Sow outdoors | Jun 8 – Jul 7 |
| Sweet corn | Sow outdoors | Jun 8 – Jun 4 |
| Watermelon & cantaloupe | Sow outdoors | Jun 22 – Jul 23 |
| Okra | Sow outdoors | Jun 15 – Jul 8 |
| Peas | Sow outdoors (spring) | Apr 22 – Jun 7 |
| Potatoes | Plant outdoors (spring) | Apr 22 – Jun 22 |
| Onions | Start seeds indoors (spring) | Mar 11 – Apr 7 |
| Onions | Transplant outdoors (spring) | May 9 – Jun 7 |
| Broccoli | Start seeds indoors (spring) | Apr 4 – May 8 |
| Broccoli | Transplant outdoors (spring) | May 9 – Jun 7 |
| Broccoli | Start seeds indoors (fall) | May 25 – Jun 4 |
| Broccoli | Transplant outdoors (fall) | Jun 24 – Jul 5 |
| Cabbage | Start seeds indoors (spring) | Mar 25 – Apr 22 |
| Cabbage | Transplant outdoors (spring) | Apr 22 – May 23 |
| Cabbage | Start seeds indoors (fall) | May 15 – Jun 14 |
| Cabbage | Transplant outdoors (fall) | Jun 14 – Jul 15 |
| Leaf lettuce | Sow outdoors (spring) | Apr 22 – Jul 8 |
| Leaf lettuce | Sow outdoors (fall) | Jun 14 – Jul 31 |
| Spinach | Sow outdoors (spring) | Apr 15 – May 29 |
| Spinach | Sow outdoors (fall) | Jul 1 – Aug 5 |
| Radishes | Sow outdoors (spring) | Apr 22 – Jun 12 |
| Radishes | Sow outdoors (fall) | Jun 14 – Aug 15 |
| Kale | Sow outdoors (spring) | May 9 – May 29 |
| Kale | Sow outdoors (fall) | Jun 7 – Jul 15 |
| Carrots | Sow outdoors (spring) | May 23 – Jul 8 |
| Carrots | Sow outdoors (fall) | May 15 – Jun 30 |
| Garlic | Plant outdoors (fall) | Sep 14 – Oct 15 |
Where these dates come from
ZIP code 83212 is matched to the NOAA station Mccammon, ID, 34.2 km away, at 4,770 ft elevation (355 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Mccammon, ID (used) | 4,770 ft | May 23 | Sep 24 |
| Downey, ID | 4,865 ft | May 31 | Sep 18 |
| American Falls, ID | 4,510 ft | May 4 | Oct 8 |
| Massacre Rocks Sp, ID | 4,195 ft | May 20 | Sep 26 |
Frost dates near Arbon
- Rockland, ID 83271 · last May 20, first Sep 26
- Pocatello, ID 83209 · last May 23, first Sep 24
- Arimo, ID 83214 · last May 23, first Sep 24
- McCammon, ID 83250 · last May 23, first Sep 24
- American Falls, ID 83211 · last May 20, first Sep 26
- Downey, ID 83234 · last May 31, first Sep 18
- Holbrook, ID 83243 · last May 22, first Sep 20
- Inkom, ID 83245 · last May 23, first Sep 24
Frequently asked questions
- When is the last frost in Arbon, ID?
- For ZIP code 83212, the average last spring frost (32°F) is May 23, based on NOAA 1991-2020 climate normals for the Mccammon, ID weather station. There is a 1-in-10 chance of a frost after June 10.
- When is the first frost in Arbon, ID?
- The average first fall frost (32°F) is September 24. There is a 1-in-10 chance of frost by September 7, so tender plants are at risk from that point on.
- How long is the growing season in 83212?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 121 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.