Frost dates for 83448Sugar City, ID
The average last spring frost in Sugar City is May 15 and the average first fall frost is September 23, giving a typical growing season of about 129 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 15
- Average first fall frost
- Sep 23
- Growing season
- 129 days
Safer after Jun 3 (1-in-10 risk)
Possible by Sep 8 (1-in-10 risk)
Last frost typically in 200 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 19 · Jun 6 · Jun 23 | Aug 30 · Sep 10 · Sep 25 | 96 days | 100% |
| Frost / freeze (32°F) | May 1 · May 15 · Jun 3 | Sep 8 · Sep 23 · Oct 7 | 129 days | 100% |
| Hard freeze (28°F) | Apr 17 · May 1 · May 13 | Sep 20 · Oct 5 · Oct 20 | 157 days | 100% |
Planting calendar for Sugar City
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 14 – Jun 20 |
| Tomatoes | Transplant outdoors | May 31 – Jun 3 |
| Peppers | Start seeds indoors | Apr 14 – May 15 |
| Peppers | Transplant outdoors | Jun 14 – Jul 15 |
| Eggplant | Start seeds indoors | May 1 – May 30 |
| Eggplant | Transplant outdoors | Jun 14 – Jul 15 |
| Cucumbers | Sow outdoors | Jun 14 – Jun 13 |
| Summer squash | Sow outdoors | May 31 – Jul 15 |
| Winter squash & pumpkins | Sow outdoors | Jun 14 – Jul 15 |
| Snap beans | Sow outdoors | May 31 – Jul 6 |
| Sweet corn | Sow outdoors | May 31 – Jun 3 |
| Watermelon & cantaloupe | Sow outdoors | Jun 14 – Jul 15 |
| Okra | Sow outdoors | Jun 7 – Jun 30 |
| Peas | Sow outdoors (spring) | Apr 14 – May 30 |
| Potatoes | Plant outdoors (spring) | Apr 14 – Jun 14 |
| Onions | Start seeds indoors (spring) | Mar 3 – Mar 30 |
| Onions | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (spring) | Mar 27 – Apr 30 |
| Broccoli | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (fall) | May 24 – Jun 3 |
| Broccoli | Transplant outdoors (fall) | Jun 23 – Jul 4 |
| Cabbage | Start seeds indoors (spring) | Mar 17 – Apr 14 |
| Cabbage | Transplant outdoors (spring) | Apr 14 – May 15 |
| Cabbage | Start seeds indoors (fall) | May 14 – Jun 13 |
| Cabbage | Transplant outdoors (fall) | Jun 13 – Jul 14 |
| Leaf lettuce | Sow outdoors (spring) | Apr 14 – Jun 30 |
| Leaf lettuce | Sow outdoors (fall) | Jun 13 – Jul 30 |
| Spinach | Sow outdoors (spring) | Apr 7 – May 21 |
| Spinach | Sow outdoors (fall) | Jun 30 – Aug 4 |
| Radishes | Sow outdoors (spring) | Apr 14 – Jun 4 |
| Radishes | Sow outdoors (fall) | Jun 13 – Aug 14 |
| Kale | Sow outdoors (spring) | May 1 – May 21 |
| Kale | Sow outdoors (fall) | Jun 6 – Jul 14 |
| Carrots | Sow outdoors (spring) | May 15 – Jun 30 |
| Carrots | Sow outdoors (fall) | May 14 – Jun 29 |
| Garlic | Plant outdoors (fall) | Sep 13 – Oct 14 |
Where these dates come from
ZIP code 83448 is matched to the NOAA station Rexburg Madison Co Ap, ID, 9.1 km away, at 4,858 ft elevation (70 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Rexburg Madison Co Ap, ID (used) | 4,858 ft | May 15 | Sep 23 |
| Sugar City, ID | 4,925 ft | May 29 | Sep 13 |
| Rexburg Byu Idaho, ID | 5,005 ft | May 12 | Sep 24 |
| Saint Anthony, ID | 4,910 ft | May 17 | Sep 22 |
Frost dates near Sugar City
- Teton, ID 83451 · last May 17, first Sep 22
- Rexburg, ID 83441 · last May 12, first Sep 24
- Newdale, ID 83436 · last May 17, first Sep 22
- Saint Anthony, ID 83445 · last May 17, first Sep 22
- Parker, ID 83438 · last May 17, first Sep 22
- Chester, ID 83421 · last May 21, first Sep 21
- Rigby, ID 83442 · last May 9, first Oct 5
- Menan, ID 83434 · last May 15, first Sep 23
Frequently asked questions
- When is the last frost in Sugar City, ID?
- For ZIP code 83448, the average last spring frost (32°F) is May 15, based on NOAA 1991-2020 climate normals for the Rexburg Madison Co Ap, ID weather station. There is a 1-in-10 chance of a frost after June 3.
- When is the first frost in Sugar City, ID?
- The average first fall frost (32°F) is September 23. There is a 1-in-10 chance of frost by September 8, so tender plants are at risk from that point on.
- How long is the growing season in 83448?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 129 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.