I know it's winter everywhere on the Northern American Continent. I have seen the news, snow in the northeast as if storms only head toward NYC! It has been snowing in the Dakotas for weeks. It is winter.
Use your compost in the weeks to come the same as you would use fertilizer and potting soil or mulch. Using compost as a mulch gives the plants a boost of fertilizer all year long. As a soil amendment, work the compost into the soil. Dig down a few inches, fill with compost, cover with soil, till before planting. As a fertilizer, use compost by making a tea. Put compost into a five gallon bucket, fill halfway with water, let set a week, then sift and pour onto plants as a liquid fertilizer.
Start your compost heap, bin or barrel and you have started your garden. We start seeds next week!