Frost dates for 04442Greenville Junction, ME
The average last spring frost in Greenville Junction is May 7 and the average first fall frost is October 9, giving a typical growing season of about 153 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 7
- Average first fall frost
- Oct 9
- Growing season
- 153 days
Safer after May 20 (1-in-10 risk)
Possible by Sep 27 (1-in-10 risk)
Last frost typically in 187 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 7 · May 21 · Jun 2 | Sep 18 · Sep 29 · Oct 10 | 130 days | 100% |
| Frost / freeze (32°F) | Apr 27 · May 7 · May 20 | Sep 27 · Oct 9 · Oct 24 | 153 days | 100% |
| Hard freeze (28°F) | Apr 15 · Apr 28 · May 7 | Oct 7 · Oct 22 · Nov 4 | 177 days | 100% |
Planting calendar for Greenville Junction
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 6 – Jun 12 |
| Tomatoes | Transplant outdoors | May 23 – Jun 19 |
| Peppers | Start seeds indoors | Apr 6 – May 7 |
| Peppers | Transplant outdoors | Jun 6 – Jul 7 |
| Eggplant | Start seeds indoors | Apr 23 – May 22 |
| Eggplant | Transplant outdoors | Jun 6 – Jul 7 |
| Cucumbers | Sow outdoors | Jun 6 – Jun 29 |
| Summer squash | Sow outdoors | May 23 – Jul 7 |
| Winter squash & pumpkins | Sow outdoors | Jun 6 – Jul 7 |
| Snap beans | Sow outdoors | May 23 – Jul 22 |
| Sweet corn | Sow outdoors | May 23 – Jun 19 |
| Watermelon & cantaloupe | Sow outdoors | Jun 6 – Jul 7 |
| Okra | Sow outdoors | May 30 – Jun 22 |
| Peas | Sow outdoors (spring) | Apr 6 – May 22 |
| Potatoes | Plant outdoors (spring) | Apr 6 – Jun 6 |
| Onions | Start seeds indoors (spring) | Feb 23 – Mar 22 |
| Onions | Transplant outdoors (spring) | Apr 23 – May 22 |
| Broccoli | Start seeds indoors (spring) | Mar 19 – Apr 22 |
| Broccoli | Transplant outdoors (spring) | Apr 23 – May 22 |
| Broccoli | Start seeds indoors (fall) | Jun 9 – Jun 19 |
| Broccoli | Transplant outdoors (fall) | Jul 9 – Jul 20 |
| Cabbage | Start seeds indoors (spring) | Mar 9 – Apr 6 |
| Cabbage | Transplant outdoors (spring) | Apr 6 – May 7 |
| Cabbage | Start seeds indoors (fall) | May 30 – Jun 29 |
| Cabbage | Transplant outdoors (fall) | Jun 29 – Jul 30 |
| Leaf lettuce | Sow outdoors (spring) | Apr 6 – Jun 22 |
| Leaf lettuce | Sow outdoors (fall) | Jun 29 – Aug 15 |
| Spinach | Sow outdoors (spring) | Mar 30 – May 13 |
| Spinach | Sow outdoors (fall) | Jul 16 – Aug 20 |
| Radishes | Sow outdoors (spring) | Apr 6 – May 27 |
| Radishes | Sow outdoors (fall) | Jun 29 – Aug 30 |
| Kale | Sow outdoors (spring) | Apr 23 – May 13 |
| Kale | Sow outdoors (fall) | Jun 22 – Jul 30 |
| Carrots | Sow outdoors (spring) | May 7 – Jun 22 |
| Carrots | Sow outdoors (fall) | May 30 – Jul 15 |
| Garlic | Plant outdoors (fall) | Sep 29 – Oct 30 |
Where these dates come from
ZIP code 04442 is matched to the NOAA station Greenville Maine Forestry Svc, ME, 7.9 km away, at 1,037 ft elevation (731 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Greenville Maine Forestry Svc, ME (used) | 1,037 ft | May 7 | Oct 9 |
| Moosehead, ME | 1,037 ft | May 13 | Sep 30 |
| Brassua Dam, ME | 1,069 ft | May 23 | Sep 29 |
| Sebec Lake, ME | 380 ft | May 16 | Oct 1 |
Frost dates near Greenville Junction
- Greenville, ME 04441 · last May 7, first Oct 9
- Shirley Mills, ME 04485 · last May 7, first Oct 9
- West Forks, ME 04985 · last May 13, first Sep 30
- Monson, ME 04464 · last May 12, first Oct 1
- Abbot, ME 04406 · last May 7, first Oct 9
- Caratunk, ME 04925 · last May 13, first Sep 30
- Guilford, ME 04443 · last May 15, first Sep 28
- Rockwood, ME 04478 · last May 20, first Sep 23
Frequently asked questions
- When is the last frost in Greenville Junction, ME?
- For ZIP code 04442, the average last spring frost (32°F) is May 7, based on NOAA 1991-2020 climate normals for the Greenville Maine Forestry Svc, ME weather station. There is a 1-in-10 chance of a frost after May 20.
- When is the first frost in Greenville Junction, ME?
- The average first fall frost (32°F) is October 9. There is a 1-in-10 chance of frost by September 27, so tender plants are at risk from that point on.
- How long is the growing season in 04442?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 153 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.