Frost dates for 83443Ririe, ID
The average last spring frost in Ririe is June 9 and the average first fall frost is September 11, giving a typical growing season of about 93 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 9
- Average first fall frost
- Sep 11
- Growing season
- 93 days
Safer after Jun 26 (1-in-10 risk)
Possible by Aug 27 (1-in-10 risk)
Last frost typically in 225 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) | — | — | 64 days | 100% |
| Frost / freeze (32°F) | May 19 · Jun 9 · Jun 26 | Aug 27 · Sep 11 · Sep 27 | 93 days | 100% |
| Hard freeze (28°F) | May 4 · May 19 · Jun 10 | Sep 4 · Sep 23 · Oct 10 | 121 days | 100% |
Planting calendar for Ririe
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 | May 9 – Jul 15 |
| Tomatoes | Transplant outdoors | Jun 25 – May 22 |
| Peppers | Start seeds indoors | May 9 – Jun 9 |
| Peppers | Transplant outdoors | Jul 9 – Aug 9 |
| Eggplant | Start seeds indoors | May 26 – Jun 24 |
| Eggplant | Transplant outdoors | Jul 9 – Aug 9 |
| Cucumbers | Sow outdoors | Jul 9 – Jun 1 |
| Summer squash | Sow outdoors | Jun 25 – Aug 9 |
| Winter squash & pumpkins | Sow outdoors | Jul 9 – Aug 9 |
| Snap beans | Sow outdoors | Jun 25 – Jun 24 |
| Sweet corn | Sow outdoors | Jun 25 – May 22 |
| Watermelon & cantaloupe | Sow outdoors | Jul 9 – Aug 9 |
| Okra | Sow outdoors | Jul 2 – Jul 25 |
| Peas | Sow outdoors (spring) | May 9 – Jun 24 |
| Potatoes | Plant outdoors (spring) | May 9 – Jul 9 |
| Onions | Start seeds indoors (spring) | Mar 28 – Apr 24 |
| Onions | Transplant outdoors (spring) | May 26 – Jun 24 |
| Broccoli | Start seeds indoors (spring) | Apr 21 – May 25 |
| Broccoli | Transplant outdoors (spring) | May 26 – Jun 24 |
| Broccoli | Start seeds indoors (fall) | May 12 – May 22 |
| Broccoli | Transplant outdoors (fall) | Jun 11 – Jun 22 |
| Cabbage | Start seeds indoors (spring) | Apr 11 – May 9 |
| Cabbage | Transplant outdoors (spring) | May 9 – Jun 9 |
| Cabbage | Start seeds indoors (fall) | May 2 – Jun 1 |
| Cabbage | Transplant outdoors (fall) | Jun 1 – Jul 2 |
| Leaf lettuce | Sow outdoors (spring) | May 9 – Jul 25 |
| Leaf lettuce | Sow outdoors (fall) | Jun 1 – Jul 18 |
| Spinach | Sow outdoors (spring) | May 2 – Jun 15 |
| Spinach | Sow outdoors (fall) | Jun 18 – Jul 23 |
| Radishes | Sow outdoors (spring) | May 9 – Jun 29 |
| Radishes | Sow outdoors (fall) | Jun 1 – Aug 2 |
| Kale | Sow outdoors (spring) | May 26 – Jun 15 |
| Kale | Sow outdoors (fall) | May 25 – Jul 2 |
| Carrots | Sow outdoors (spring) | Jun 9 – Jul 25 |
| Carrots | Sow outdoors (fall) | May 2 – Jun 17 |
| Garlic | Plant outdoors (fall) | Sep 1 – Oct 2 |
Where these dates come from
ZIP code 83443 is matched to the NOAA station Idaho Falls 16 Se, ID, 28.4 km away, at 5,828 ft elevation (51 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Idaho Falls 16 Se, ID (used) | 5,828 ft | Jun 9 | Sep 11 |
| Swan Valley, ID | 5,397 ft | — | — |
| Rigby, ID | 4,856 ft | May 9 | Oct 5 |
| Rexburg Byu Idaho, ID | 5,005 ft | May 12 | Sep 24 |
Frost dates near Ririe
- Swan Valley, ID 83449 · last —, first —
- Irwin, ID 83428 · last —, first —
- Idaho Falls, ID 83401 · last May 9, first Oct 1
- Rexburg, ID 83441 · last May 12, first Sep 24
- Iona, ID 83427 · last May 9, first Oct 1
- Victor, ID 83455 · last Jun 13, first Sep 9
- Rigby, ID 83442 · last May 9, first Oct 5
- Ucon, ID 83454 · last May 9, first Oct 1
Frequently asked questions
- When is the last frost in Ririe, ID?
- For ZIP code 83443, the average last spring frost (32°F) is June 9, based on NOAA 1991-2020 climate normals for the Idaho Falls 16 Se, ID weather station. There is a 1-in-10 chance of a frost after June 26.
- When is the first frost in Ririe, ID?
- The average first fall frost (32°F) is September 11. There is a 1-in-10 chance of frost by August 27, so tender plants are at risk from that point on.
- How long is the growing season in 83443?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 93 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.