Rocky Mountain Compost, Inc.

If you’re doing any kind of serious gardening or landscaping around Billings, this is honestly the place locals go first. The soil and mulch quality is solid, and the staff actually know their stuff — they’ll help you figure out what you need without making you feel like you’re wasting their time. Delivery is quick and reliable, which matters when you’re mid-project and don’t want to lose momentum. Worth having on your list before you head to a big box store.