Blocking a crochet blanket usually means working in sections, since few blocking surfaces are large enough for a full blanket at once. I block granny squares individually before seaming them together, which makes a much bigger difference to the finished look than blocking the whole assembled blanket at the end.
Blocking squares before seaming
Squares that come off the hook slightly uneven square up nicely once pinned to exact, matching measurements. I learned this after seaming an unblocked blanket that never quite laid flat, since every square was a slightly different size.
Blocking a full assembled blanket
For a blanket worked in one piece rather than joined squares, I block it in overlapping sections, moving my board or mats across the piece a few feet at a time. This takes longer than blocking a single garment but keeps the tension even across the whole piece.
Frequently asked questions
Should I block granny squares before or after seaming?
Before, in almost every case. Blocking each square to the same exact measurements first makes seaming far easier and the finished blanket lie flatter.
Do I need a giant blocking board for a whole blanket?
Not necessarily. I block large pieces in overlapping sections using interlocking foam mats, moving across the blanket rather than needing one huge surface.
See our full blocking tools comparison
Compare boards, mats, and pins before you start a big project.