Frost dates for Hartford Brainard Fld, Connecticut
Half of years have their last spring frost by April 17 — but 1 year in 10 still frosts after May 1.
Every other site gives you one date. A frost date is not a date: it is a percentile from 30 years of records at a nearby weather station, and planting to the median means losing the crop in half of years. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
- Frost this late in 1 year in 10
- May 1
- 1 year in 5
- April 27
- 3 years in 10
- April 23
- 2 years in 5
- April 20
- Half of years (the median)
- April 17
First fall freeze
- Freeze this early in 1 year in 10
- October 12
- 1 year in 5
- October 16
- 3 years in 10
- October 20
- 2 years in 5
- October 23
- Half of years (the median)
- October 26
- Growing season
- about 191 days
- Hardiness zone nearby
- 6b
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, station Hartford Brainard Fld (USW00014752), at 41.74, -72.65. These are that station's own records, unshifted. The further your garden is from it, the less exactly they describe your ground — the planner resolves the nearest station to your own ZIP and lowers its confidence with distance, rather than presenting one number as if it were measured in your yard.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a hundred metres away does not. No table can know that about your garden. Your own logged frosts eventually can.
ZIP codes nearest this station
06002, 06016, 06023, 06026, 06032, 06033, 06037, 06040, 06042, 06043, 06051, 06052, 06053, 06062, 06066, 06067, 06073, 06074, 06081, 06088, 06095, 06096, 06103, 06105, 06106, 06107, 06108, 06109, 06110, 06111, 06112, 06114, 06117, 06118, 06119, 06120, 06160, 06414, 06416, 06423, 06424, 06438, 06441, 06444, 06447, 06450, 06451, 06455, 06456, 06457, 06467, 06469, 06479, 06480, 06481, 06489.
What can I plant here, and when? →
Nearby stations
The nearest stations, and how their last-frost dates compare — the frost gradient across your area, which no single station shows.
- Bakersville, CT — last frost by May 8
- Storrs Hcn, CT — last frost by April 19
- Westfield Barnes Muni Ap, MA — last frost by May 3
- New Haven Tweed Ap, CT — last frost by April 17
- Belchertown, MA — last frost by May 3
- Bridgeport Sikorsky Mem Ap, CT — last frost by April 5