Silo

Robin builds a silo in two days. It costs 100g, 100 stone, 10 clay, and 5 copper bars. The footprint is 3 by 3. Each silo holds 240 hay. Checking one silo shows the combined hay and the combined cap of every silo on the farm. Distance to a barn or coop does not matter. The hay hopper inside those buildings draws from the silos.

Hay you already hold can be pushed into a silo, or into a hopper. Hay from wheat goes to your inventory, not the silo.

In 1.6, grass grown outside no longer vanishes on Winter 1. It goes dormant and gives less hay when cut. Animals eat no hay on the Festival of Ice or the Feast of the Winter Star, so 26 hay per animal covers a winter. One silo feeds 9 animals on that count. Three silos cover the 24 animals of a full deluxe barn and a full deluxe coop.