Frost dates for 02839Mapleville, RI
The average last spring frost in Mapleville is April 25 and the average first fall frost is October 19, giving a typical growing season of about 176 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 25
- Average first fall frost
- Oct 19
- Growing season
- 176 days
Safer after May 9 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 175 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) | Apr 26 · May 7 · May 21 | Sep 26 · Oct 7 · Oct 21 | 152 days | 100% |
| Frost / freeze (32°F) | Apr 13 · Apr 25 · May 9 | Oct 4 · Oct 19 · Nov 2 | 176 days | 100% |
| Hard freeze (28°F) | Apr 1 · Apr 12 · Apr 26 | Oct 15 · Oct 30 · Nov 13 | 201 days | 100% |
Planting calendar for Mapleville
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 | Mar 25 – May 31 |
| Tomatoes | Transplant outdoors | May 11 – Jun 29 |
| Peppers | Start seeds indoors | Mar 25 – Apr 25 |
| Peppers | Transplant outdoors | May 25 – Jun 25 |
| Eggplant | Start seeds indoors | Apr 11 – May 10 |
| Eggplant | Transplant outdoors | May 25 – Jun 25 |
| Cucumbers | Sow outdoors | May 25 – Jul 9 |
| Summer squash | Sow outdoors | May 11 – Jun 25 |
| Winter squash & pumpkins | Sow outdoors | May 25 – Jun 25 |
| Snap beans | Sow outdoors | May 11 – Aug 1 |
| Sweet corn | Sow outdoors | May 11 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 25 – Jun 25 |
| Okra | Sow outdoors | May 18 – Jun 10 |
| Peas | Sow outdoors (spring) | Mar 25 – May 10 |
| Potatoes | Plant outdoors (spring) | Mar 25 – May 25 |
| Onions | Start seeds indoors (spring) | Feb 11 – Mar 10 |
| Onions | Transplant outdoors (spring) | Apr 11 – May 10 |
| Broccoli | Start seeds indoors (spring) | Mar 7 – Apr 10 |
| Broccoli | Transplant outdoors (spring) | Apr 11 – May 10 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 25 – Mar 25 |
| Cabbage | Transplant outdoors (spring) | Mar 25 – Apr 25 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 25 – Jun 10 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 18 – May 1 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 25 – May 15 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 11 – May 1 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 25 – Jun 10 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 02839 is matched to the NOAA station N Foster 1 E, RI, 12.4 km away, at 630 ft elevation (151 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| N Foster 1 E, RI (used) | 630 ft | Apr 25 | Oct 19 |
| Woonsocket, RI | 110 ft | Apr 22 | Oct 19 |
| W Thompson Lake, CT | 360 ft | May 1 | Oct 9 |
| West Medway, MA | 210 ft | Apr 30 | Oct 9 |
Frost dates near Mapleville
- Oakland, RI 02858 · last Apr 22, first Oct 19
- Glendale, RI 02826 · last Apr 22, first Oct 19
- Harrisville, RI 02830 · last Apr 25, first Oct 19
- Chepachet, RI 02814 · last Apr 25, first Oct 19
- Pascoag, RI 02859 · last May 1, first Oct 9
- North Smithfield, RI 02896 · last Apr 22, first Oct 19
- Harmony, RI 02829 · last Apr 22, first Oct 19
- Slatersville, RI 02876 · last Apr 22, first Oct 19
Frequently asked questions
- When is the last frost in Mapleville, RI?
- For ZIP code 02839, the average last spring frost (32°F) is April 25, based on NOAA 1991-2020 climate normals for the N Foster 1 E, RI weather station. There is a 1-in-10 chance of a frost after May 9.
- When is the first frost in Mapleville, RI?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 02839?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 176 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.