Colorado Tree & Lawn Specialists. Your Denver Colorado tree service and arborist experts. Offering Tree Removal - Tree Trimming - Stump Grinding - Arborist Services. Are you looking for a skilled Denver Metro arborist? The owner of Colorado Tree & Lawn Specialists has 25 years of experience. Serving Arvada, Aurora, Brighton, Broomfield, Centennial, Commerce City, Evergreen, Golden, Highlands Ranch, Lakewood, Littleton, Lone Tree, Montbello, Parker, Thornton, Westminster, and more.