DCHP-1 Online
thaw-up 
n. the melting of the snow and the frozen ground in spring; spring thaw.
See also: break-up (def. 2)
- 1925 Winter went by; the thaw-up came. Breaking and seeding, on a share of the crop.
- 1925 Winter went by; the thaw-up came. Breaking and seeding, on a share of the crop.