Frost dates for 04746Grand Isle, ME
The average last spring frost in Grand Isle is May 23 and the average first fall frost is September 26, giving a typical growing season of about 125 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 23
- Average first fall frost
- Sep 26
- Growing season
- 125 days
Safer after Jun 5 (1-in-10 risk)
Possible by Sep 11 (1-in-10 risk)
Last frost typically in 203 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 4 · Jun 17 | Sep 2 · Sep 15 · Sep 29 | 101 days | 100% |
| Frost / freeze (32°F) | May 8 · May 23 · Jun 5 | Sep 11 · Sep 26 · Oct 7 | 125 days | 100% |
| Hard freeze (28°F) | Apr 26 · May 7 · May 23 | Sep 23 · Oct 5 · Oct 20 | 150 days | 100% |
Planting calendar for Grand Isle
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 6 |
| 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 16 |
| Summer squash | Sow outdoors | Jun 8 – Jul 23 |
| Winter squash & pumpkins | Sow outdoors | Jun 22 – Jul 23 |
| Snap beans | Sow outdoors | Jun 8 – Jul 9 |
| Sweet corn | Sow outdoors | Jun 8 – Jun 6 |
| 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 27 – Jun 6 |
| Broccoli | Transplant outdoors (fall) | Jun 26 – Jul 7 |
| Cabbage | Start seeds indoors (spring) | Mar 25 – Apr 22 |
| Cabbage | Transplant outdoors (spring) | Apr 22 – May 23 |
| Cabbage | Start seeds indoors (fall) | May 17 – Jun 16 |
| Cabbage | Transplant outdoors (fall) | Jun 16 – Jul 17 |
| Leaf lettuce | Sow outdoors (spring) | Apr 22 – Jul 8 |
| Leaf lettuce | Sow outdoors (fall) | Jun 16 – Aug 2 |
| Spinach | Sow outdoors (spring) | Apr 15 – May 29 |
| Spinach | Sow outdoors (fall) | Jul 3 – Aug 7 |
| Radishes | Sow outdoors (spring) | Apr 22 – Jun 12 |
| Radishes | Sow outdoors (fall) | Jun 16 – Aug 17 |
| Kale | Sow outdoors (spring) | May 9 – May 29 |
| Kale | Sow outdoors (fall) | Jun 9 – Jul 17 |
| Carrots | Sow outdoors (spring) | May 23 – Jul 8 |
| Carrots | Sow outdoors (fall) | May 17 – Jul 2 |
| Garlic | Plant outdoors (fall) | Sep 16 – Oct 17 |
Where these dates come from
ZIP code 04746 is matched to the NOAA station Van Buren 2, ME, 22.3 km away, at 456 ft elevation (66 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Van Buren 2, ME (used) | 456 ft | May 23 | Sep 26 |
| Frenchville Aroostook Ap, ME | 988 ft | May 6 | Oct 2 |
| Ft Kent, ME | 610 ft | May 23 | Sep 24 |
| Limestone 4 Nnw, ME | 737 ft | May 16 | Sep 24 |
Frost dates near Grand Isle
- Saint David, ME 04773 · last May 6, first Oct 2
- Madawaska, ME 04756 · last May 6, first Oct 2
- Saint Agatha, ME 04772 · last May 6, first Oct 2
- Frenchville, ME 04745 · last May 23, first Sep 24
- Van Buren, ME 04785 · last May 23, first Sep 26
- Sinclair, ME 04779 · last May 23, first Sep 24
- Stockholm, ME 04783 · last May 7, first Oct 1
- Fort Kent, ME 04743 · last May 23, first Sep 24
Frequently asked questions
- When is the last frost in Grand Isle, ME?
- For ZIP code 04746, the average last spring frost (32°F) is May 23, based on NOAA 1991-2020 climate normals for the Van Buren 2, ME weather station. There is a 1-in-10 chance of a frost after June 5.
- When is the first frost in Grand Isle, ME?
- The average first fall frost (32°F) is September 26. 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 04746?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 125 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.