new hampshire frost dates, county by county.

Belknap County

Last spring: 04-17 · First fall: 11-01

Carroll County

Last spring: 05-04 · First fall: 10-04

Cheshire County

Last spring: 05-02 · First fall: 10-10

Coos County

Last spring: 05-17 · First fall: 09-30

Grafton County

Last spring: 04-30 · First fall: 10-20

Hillsborough County

Last spring: 04-20 · First fall: 10-16

Merrimack County

Last spring: 04-30 · First fall: 10-09

Rockingham County

Last spring: 04-24 · First fall: 10-15

Strafford County

Last spring: 04-17 · First fall: 10-23

Sullivan County

Last spring: 05-01 · First fall: 10-11