Frost dates for 04945Jackman, ME
The average last spring frost in Jackman is May 26 and the average first fall frost is September 23, giving a typical growing season of about 119 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 26
- Average first fall frost
- Sep 23
- Growing season
- 119 days
Safer after Jun 7 (1-in-10 risk)
Possible by Sep 8 (1-in-10 risk)
Last frost typically in 206 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 26 · Jun 7 · Jun 24 | Aug 27 · Sep 8 · Sep 22 | 93 days | 100% |
| Frost / freeze (32°F) | May 10 · May 26 · Jun 7 | Sep 8 · Sep 23 · Oct 5 | 119 days | 100% |
| Hard freeze (28°F) | Apr 29 · May 11 · May 27 | Sep 18 · Oct 3 · Oct 19 | 143 days | 100% |
Planting calendar for Jackman
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 25 – Jul 1 |
| Tomatoes | Transplant outdoors | Jun 11 – Jun 3 |
| Peppers | Start seeds indoors | Apr 25 – May 26 |
| Peppers | Transplant outdoors | Jun 25 – Jul 26 |
| Eggplant | Start seeds indoors | May 12 – Jun 10 |
| Eggplant | Transplant outdoors | Jun 25 – Jul 26 |
| Cucumbers | Sow outdoors | Jun 25 – Jun 13 |
| Summer squash | Sow outdoors | Jun 11 – Jul 26 |
| Winter squash & pumpkins | Sow outdoors | Jun 25 – Jul 26 |
| Snap beans | Sow outdoors | Jun 11 – Jul 6 |
| Sweet corn | Sow outdoors | Jun 11 – Jun 3 |
| Watermelon & cantaloupe | Sow outdoors | Jun 25 – Jul 26 |
| Okra | Sow outdoors | Jun 18 – Jul 11 |
| Peas | Sow outdoors (spring) | Apr 25 – Jun 10 |
| Potatoes | Plant outdoors (spring) | Apr 25 – Jun 25 |
| Onions | Start seeds indoors (spring) | Mar 14 – Apr 10 |
| Onions | Transplant outdoors (spring) | May 12 – Jun 10 |
| Broccoli | Start seeds indoors (spring) | Apr 7 – May 11 |
| Broccoli | Transplant outdoors (spring) | May 12 – Jun 10 |
| Broccoli | Start seeds indoors (fall) | May 24 – Jun 3 |
| Broccoli | Transplant outdoors (fall) | Jun 23 – Jul 4 |
| Cabbage | Start seeds indoors (spring) | Mar 28 – Apr 25 |
| Cabbage | Transplant outdoors (spring) | Apr 25 – May 26 |
| Cabbage | Start seeds indoors (fall) | May 14 – Jun 13 |
| Cabbage | Transplant outdoors (fall) | Jun 13 – Jul 14 |
| Leaf lettuce | Sow outdoors (spring) | Apr 25 – Jul 11 |
| Leaf lettuce | Sow outdoors (fall) | Jun 13 – Jul 30 |
| Spinach | Sow outdoors (spring) | Apr 18 – Jun 1 |
| Spinach | Sow outdoors (fall) | Jun 30 – Aug 4 |
| Radishes | Sow outdoors (spring) | Apr 25 – Jun 15 |
| Radishes | Sow outdoors (fall) | Jun 13 – Aug 14 |
| Kale | Sow outdoors (spring) | May 12 – Jun 1 |
| Kale | Sow outdoors (fall) | Jun 6 – Jul 14 |
| Carrots | Sow outdoors (spring) | May 26 – Jul 11 |
| Carrots | Sow outdoors (fall) | May 14 – Jun 29 |
| Garlic | Plant outdoors (fall) | Sep 13 – Oct 14 |
Where these dates come from
ZIP code 04945 is matched to the NOAA station Jackman, ME, 1 km away, at 1,214 ft elevation (36 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Jackman, ME (used) | 1,214 ft | May 26 | Sep 23 |
| Brassua Dam, ME | 1,069 ft | May 23 | Sep 29 |
| Pittston Farms Nepp, ME | 1,076 ft | May 21 | Sep 21 |
| Pittston Farm, ME | 1,100 ft | May 20 | Sep 23 |
Frost dates near Jackman
- West Forks, ME 04985 · last May 13, first Sep 30
- Rockwood, ME 04478 · last May 20, first Sep 23
- Eustis, ME 04936 · last May 23, first Sep 24
- Greenville Junction, ME 04442 · last May 7, first Oct 9
- Caratunk, ME 04925 · last May 13, first Sep 30
- Greenville, ME 04441 · last May 7, first Oct 9
- Shirley Mills, ME 04485 · last May 7, first Oct 9
- Stratton, ME 04982 · last May 23, first Sep 27
Frequently asked questions
- When is the last frost in Jackman, ME?
- For ZIP code 04945, the average last spring frost (32°F) is May 26, based on NOAA 1991-2020 climate normals for the Jackman, ME weather station. There is a 1-in-10 chance of a frost after June 7.
- When is the first frost in Jackman, ME?
- 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 04945?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 119 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.