Frost dates for 05840Granby, VT
The average last spring frost in Granby is May 19 and the average first fall frost is September 29, giving a typical growing season of about 129 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 19
- Average first fall frost
- Sep 29
- Growing season
- 129 days
Safer after Jun 3 (1-in-10 risk)
Possible by Sep 14 (1-in-10 risk)
Last frost typically in 197 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 20 · Jun 2 · Jun 16 | Sep 2 · Sep 15 · Sep 30 | 103 days | 100% |
| Frost / freeze (32°F) | May 3 · May 19 · Jun 3 | Sep 14 · Sep 29 · Oct 13 | 129 days | 100% |
| Hard freeze (28°F) | Apr 23 · May 5 · May 19 | Sep 25 · Oct 9 · Oct 28 | 155 days | 100% |
Planting calendar for Granby
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 18 – Jun 24 |
| Tomatoes | Transplant outdoors | Jun 4 – Jun 9 |
| Peppers | Start seeds indoors | Apr 18 – May 19 |
| Peppers | Transplant outdoors | Jun 18 – Jul 19 |
| Eggplant | Start seeds indoors | May 5 – Jun 3 |
| Eggplant | Transplant outdoors | Jun 18 – Jul 19 |
| Cucumbers | Sow outdoors | Jun 18 – Jun 19 |
| Summer squash | Sow outdoors | Jun 4 – Jul 19 |
| Winter squash & pumpkins | Sow outdoors | Jun 18 – Jul 19 |
| Snap beans | Sow outdoors | Jun 4 – Jul 12 |
| Sweet corn | Sow outdoors | Jun 4 – Jun 9 |
| Watermelon & cantaloupe | Sow outdoors | Jun 18 – Jul 19 |
| Okra | Sow outdoors | Jun 11 – Jul 4 |
| Peas | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Potatoes | Plant outdoors (spring) | Apr 18 – Jun 18 |
| Onions | Start seeds indoors (spring) | Mar 7 – Apr 3 |
| Onions | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (spring) | Mar 31 – May 4 |
| Broccoli | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (fall) | May 30 – Jun 9 |
| Broccoli | Transplant outdoors (fall) | Jun 29 – Jul 10 |
| Cabbage | Start seeds indoors (spring) | Mar 21 – Apr 18 |
| Cabbage | Transplant outdoors (spring) | Apr 18 – May 19 |
| Cabbage | Start seeds indoors (fall) | May 20 – Jun 19 |
| Cabbage | Transplant outdoors (fall) | Jun 19 – Jul 20 |
| Leaf lettuce | Sow outdoors (spring) | Apr 18 – Jul 4 |
| Leaf lettuce | Sow outdoors (fall) | Jun 19 – Aug 5 |
| Spinach | Sow outdoors (spring) | Apr 11 – May 25 |
| Spinach | Sow outdoors (fall) | Jul 6 – Aug 10 |
| Radishes | Sow outdoors (spring) | Apr 18 – Jun 8 |
| Radishes | Sow outdoors (fall) | Jun 19 – Aug 20 |
| Kale | Sow outdoors (spring) | May 5 – May 25 |
| Kale | Sow outdoors (fall) | Jun 12 – Jul 20 |
| Carrots | Sow outdoors (spring) | May 19 – Jul 4 |
| Carrots | Sow outdoors (fall) | May 20 – Jul 5 |
| Garlic | Plant outdoors (fall) | Sep 19 – Oct 20 |
Where these dates come from
ZIP code 05840 is matched to the NOAA station Island Pond, VT, 19.9 km away, at 1,200 ft elevation (280 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Island Pond, VT (used) | 1,200 ft | May 19 | Sep 29 |
| N Stratford, NH | 950 ft | May 19 | Sep 29 |
| E Haven, VT | 1,000 ft | May 30 | Sep 16 |
| Island Pond Ap, VT | 1,194 ft | May 16 | Sep 28 |
Frost dates near Granby
- Guildhall, VT 05905 · last May 19, first Sep 29
- East Haven, VT 05837 · last May 19, first Sep 29
- North Stratford, NH 03590 · last May 23, first Sep 22
- North Concord, VT 05858 · last Jun 1, first Sep 13
- West Burke, VT 05871 · last May 9, first Oct 1
- East Burke, VT 05832 · last Jun 1, first Sep 13
- Groveton, NH 03582 · last May 18, first Sep 30
- Island Pond, VT 05846 · last May 19, first Sep 29
Frequently asked questions
- When is the last frost in Granby, VT?
- For ZIP code 05840, the average last spring frost (32°F) is May 19, based on NOAA 1991-2020 climate normals for the Island Pond, VT weather station. There is a 1-in-10 chance of a frost after June 3.
- When is the first frost in Granby, VT?
- The average first fall frost (32°F) is September 29. There is a 1-in-10 chance of frost by September 14, so tender plants are at risk from that point on.
- How long is the growing season in 05840?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 129 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.