Frost dates for 59353Wibaux, MT
The average last spring frost in Wibaux is May 27 and the average first fall frost is September 16, giving a typical growing season of about 112 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 27
- Average first fall frost
- Sep 16
- Growing season
- 112 days
Safer after Jun 13 (1-in-10 risk)
Possible by Sep 2 (1-in-10 risk)
Last frost typically in 212 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 25 · Jun 8 · Jun 26 | Aug 15 · Sep 3 · Sep 19 | 85 days | 100% |
| Frost / freeze (32°F) | May 15 · May 27 · Jun 13 | Sep 2 · Sep 16 · Sep 29 | 112 days | 100% |
| Hard freeze (28°F) | May 4 · May 17 · Jun 1 | Sep 10 · Sep 26 · Oct 10 | 131 days | 100% |
Planting calendar for Wibaux
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 26 – Jul 2 |
| Tomatoes | Transplant outdoors | Jun 12 – May 27 |
| Peppers | Start seeds indoors | Apr 26 – May 27 |
| Peppers | Transplant outdoors | Jun 26 – Jul 27 |
| Eggplant | Start seeds indoors | May 13 – Jun 11 |
| Eggplant | Transplant outdoors | Jun 26 – Jul 27 |
| Cucumbers | Sow outdoors | Jun 26 – Jun 6 |
| Summer squash | Sow outdoors | Jun 12 – Jul 27 |
| Winter squash & pumpkins | Sow outdoors | Jun 26 – Jul 27 |
| Snap beans | Sow outdoors | Jun 12 – Jun 29 |
| Sweet corn | Sow outdoors | Jun 12 – May 27 |
| Watermelon & cantaloupe | Sow outdoors | Jun 26 – Jul 27 |
| Okra | Sow outdoors | Jun 19 – Jul 12 |
| Peas | Sow outdoors (spring) | Apr 26 – Jun 11 |
| Potatoes | Plant outdoors (spring) | Apr 26 – Jun 26 |
| Onions | Start seeds indoors (spring) | Mar 15 – Apr 11 |
| Onions | Transplant outdoors (spring) | May 13 – Jun 11 |
| Broccoli | Start seeds indoors (spring) | Apr 8 – May 12 |
| Broccoli | Transplant outdoors (spring) | May 13 – Jun 11 |
| Broccoli | Start seeds indoors (fall) | May 17 – May 27 |
| Broccoli | Transplant outdoors (fall) | Jun 16 – Jun 27 |
| Cabbage | Start seeds indoors (spring) | Mar 29 – Apr 26 |
| Cabbage | Transplant outdoors (spring) | Apr 26 – May 27 |
| Cabbage | Start seeds indoors (fall) | May 7 – Jun 6 |
| Cabbage | Transplant outdoors (fall) | Jun 6 – Jul 7 |
| Leaf lettuce | Sow outdoors (spring) | Apr 26 – Jul 12 |
| Leaf lettuce | Sow outdoors (fall) | Jun 6 – Jul 23 |
| Spinach | Sow outdoors (spring) | Apr 19 – Jun 2 |
| Spinach | Sow outdoors (fall) | Jun 23 – Jul 28 |
| Radishes | Sow outdoors (spring) | Apr 26 – Jun 16 |
| Radishes | Sow outdoors (fall) | Jun 6 – Aug 7 |
| Kale | Sow outdoors (spring) | May 13 – Jun 2 |
| Kale | Sow outdoors (fall) | May 30 – Jul 7 |
| Carrots | Sow outdoors (spring) | May 27 – Jul 12 |
| Carrots | Sow outdoors (fall) | May 7 – Jun 22 |
| Garlic | Plant outdoors (fall) | Sep 6 – Oct 7 |
Where these dates come from
ZIP code 59353 is matched to the NOAA station Wibaux 2 E, MT, 3.6 km away, at 2,696 ft elevation (22 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Wibaux 2 E, MT (used) | 2,696 ft | May 27 | Sep 16 |
| Beach, ND | 2,800 ft | May 16 | Sep 26 |
| Carlyle 13 Nw, MT | 3,145 ft | May 18 | Sep 29 |
| Trotters 3 Sse, ND | 2,420 ft | May 15 | Sep 25 |
Frost dates near Wibaux
- Beach, ND 58621 · last May 16, first Sep 26
- Sentinel Butte, ND 58654 · last May 16, first Sep 26
- Golva, ND 58632 · last May 16, first Sep 26
- Glendive, MT 59330 · last May 3, first Oct 4
- Medora, ND 58645 · last May 19, first Sep 20
- Savage, MT 59262 · last May 12, first Sep 25
- Mildred, MT 59341 · last May 20, first Sep 22
- Baker, MT 59313 · last May 16, first Sep 26
Frequently asked questions
- When is the last frost in Wibaux, MT?
- For ZIP code 59353, the average last spring frost (32°F) is May 27, based on NOAA 1991-2020 climate normals for the Wibaux 2 E, MT weather station. There is a 1-in-10 chance of a frost after June 13.
- When is the first frost in Wibaux, MT?
- The average first fall frost (32°F) is September 16. There is a 1-in-10 chance of frost by September 2, so tender plants are at risk from that point on.
- How long is the growing season in 59353?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 112 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.