Frost dates for 59535Lloyd, MT
The average last spring frost in Lloyd is May 23 and the average first fall frost is September 23, 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 23
- Growing season
- 121 days
Safer after Jun 3 (1-in-10 risk)
Possible by Sep 11 (1-in-10 risk)
Last frost typically in 201 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 23 · Jun 2 · Jun 18 | Aug 26 · Sep 10 · Sep 23 | 97 days | 100% |
| Frost / freeze (32°F) | May 11 · May 23 · Jun 3 | Sep 11 · Sep 23 · Oct 3 | 121 days | 100% |
| Hard freeze (28°F) | Apr 30 · May 11 · May 24 | Sep 18 · Sep 30 · Oct 14 | 142 days | 100% |
Planting calendar for Lloyd
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 3 |
| 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 13 |
| Summer squash | Sow outdoors | Jun 8 – Jul 23 |
| Winter squash & pumpkins | Sow outdoors | Jun 22 – Jul 23 |
| Snap beans | Sow outdoors | Jun 8 – Jul 6 |
| Sweet corn | Sow outdoors | Jun 8 – Jun 3 |
| 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 24 – Jun 3 |
| Broccoli | Transplant outdoors (fall) | Jun 23 – Jul 4 |
| Cabbage | Start seeds indoors (spring) | Mar 25 – Apr 22 |
| Cabbage | Transplant outdoors (spring) | Apr 22 – May 23 |
| Cabbage | Start seeds indoors (fall) | May 14 – Jun 13 |
| Cabbage | Transplant outdoors (fall) | Jun 13 – Jul 14 |
| Leaf lettuce | Sow outdoors (spring) | Apr 22 – Jul 8 |
| Leaf lettuce | Sow outdoors (fall) | Jun 13 – Jul 30 |
| Spinach | Sow outdoors (spring) | Apr 15 – May 29 |
| Spinach | Sow outdoors (fall) | Jun 30 – Aug 4 |
| Radishes | Sow outdoors (spring) | Apr 22 – Jun 12 |
| Radishes | Sow outdoors (fall) | Jun 13 – Aug 14 |
| Kale | Sow outdoors (spring) | May 9 – May 29 |
| Kale | Sow outdoors (fall) | Jun 6 – Jul 14 |
| Carrots | Sow outdoors (spring) | May 23 – Jul 8 |
| Carrots | Sow outdoors (fall) | May 14 – Jun 29 |
| Garlic | Plant outdoors (fall) | Sep 13 – Oct 14 |
Where these dates come from
ZIP code 59535 is matched to the NOAA station Chinook 35Se, MT, 30.2 km away, at 3,360 ft elevation (121 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Chinook 35Se, MT (used) | 3,360 ft | May 23 | Sep 23 |
| Winifred, MT | 3,243 ft | May 16 | Sep 23 |
| Harlem 20S, MT | 2,695 ft | May 24 | Sep 22 |
| Zortman, MT | 4,035 ft | May 18 | Sep 23 |
Frost dates near Lloyd
- Winifred, MT 59489 · last May 16, first Sep 23
- Hays, MT 59527 · last May 18, first Sep 23
- Box Elder, MT 59521 · last May 17, first Sep 25
- Zortman, MT 59546 · last May 12, first Sep 27
- Big Sandy, MT 59520 · last May 17, first Sep 25
- Chinook, MT 59523 · last May 14, first Sep 23
- Zurich, MT 59547 · last May 14, first Sep 23
- Havre, MT 59501 · last May 15, first Sep 23
Frequently asked questions
- When is the last frost in Lloyd, MT?
- For ZIP code 59535, the average last spring frost (32°F) is May 23, based on NOAA 1991-2020 climate normals for the Chinook 35Se, MT weather station. There is a 1-in-10 chance of a frost after June 3.
- When is the first frost in Lloyd, MT?
- The average first fall frost (32°F) is September 23. There is a 1-in-10 chance of frost by September 11, so tender plants are at risk from that point on.
- How long is the growing season in 59535?
- 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.