Keep Your Compost Active Through Winter

By James Wilson · October 8, 2026

Compost Does Not Die in Winter

A well-built compost pile generates its own heat. The core can reach 120-150°F even when outside temperatures are below freezing. Microbial activity slows at the edges but continues in the center. With proper management, your pile will produce finished compost by spring.

Build a Large Enough Pile

Winter compost needs critical mass — at least 3 feet x 3 feet x 3 feet. Smaller piles lose heat faster than microbes generate it. If your pile is smaller, insulate it with straw bales or bags of leaves stacked around the outside.

Balancing Greens and Browns

In fall, brown materials (leaves, straw, shredded paper) are abundant. Save bags of leaves to mix with kitchen scraps all winter. Aim for 3 parts brown to 1 part green by volume. Layer them in the pile — do not dump kitchen scraps on top without covering with browns, which attracts rodents.

Chop and Shred for Speed

Smaller pieces decompose faster because microbes attack from the surface. Run leaves through a mower, chop kitchen scraps roughly, and break up woody material. Shredded material also packs tighter, retaining more heat.

Moisture Management

Winter compost tends to be too wet from rain and snow. Cover the pile with a tarp to shed excess water. A waterlogged pile goes anaerobic and smells bad. The ideal moisture level is like a wrung-out sponge — damp but not dripping.

Turn Less in Winter

Turning a winter pile releases trapped heat and resets the process. Turn it once in late fall when you build it, then leave it until March. The outer layers will be less decomposed — move them to the center when you turn in spring. By May, you will have finished compost for the new season.