You've Got Questions? We've Got Answers!

If you’ve never hired an arborist before, you will likely have some questions regarding your project. We have over 28 years of combined experience in the tree service industry and are happy to answer any questions you may have. We’ve done our best to answer our most frequently asked questions below.

What is the difference between an arborist and an ISA Certified Arborist?

Arborist – a general term for anyone who specializes in tree care or tree services. The term does not specify any particular level of competency.

Certified Arborist – An ISA Certified Arborist must have at least 3 years of experience in tree care, or a 2-year degree in arboriculture + 2 years experience, or a 4-year degree in a related field + 1 year of experience; plus, pass a 200-question multiple choice exam, earn 30 CEUs every 3 years to recertify, and pay all fees associated with education, testing, and recertification.

How long does it take to receive an estimate?

In order to give you a proper estimate, one of our ISA Certified Arborists will have to first inspect your property. At Green Forest Tree Service we can usually schedule a consultation within 7-10 business days; however, this completely depends on the time of year and scheduling demands. It is best to complete our Free Estimate Form or call (303) 396-0500.

When is the best time of the year to prune a tree?

Generally speaking, it is best to prune most trees in late winter, between February and March. During this time of the year, the trees are still dormant and the wound closure will be fast if pruning occurs before the new growth emerges.

How do I schedule work do be done at my home, business or property?

To schedule work at your business, home or property, give us a call at (303) 396-0500, fill out our online form, or email

What is tree cabling and why do you cable trees?

Cabling is when you use cables to stabilize a tree that is growing in an unsustainable manner. Cabling must be performed by a certified arborist because if the cables are not installed properly, the tree’s trunk or branches can be strangled. A certified arborist will know where and how to position the cables in order to save the tree.

How can you tell if a sick tree can be saved?

It is best give us a call at (303) 396-0500 and schedule a time for a certified arborist to visit your property. Alternatively, you can fill out our Free Estimate Form and upload a photo of your tree.

What are your service areas?

We service the majority of Metro Denver, including Arvada, Aurora, Bow Mar, Centennial, Castle Rock, Cherry Hills, Denver, Englewood, Genesee, Golden, Highlands Ranch, Idledale, Lakewood, Leyden, Littleton, Lone Tree, Morrison, Northglenn, Parker, Sheridan, Thornton, Westminster, Wheat Ridge, and west toward the Rockies.

What payment methods do you accept?

We accept cash, check and all major credit cards.

Do you haul all wood and debris?

We will haul and chip natural logs, brush and branches. Smaller piles will usually be covered under our $75 destination fee. Larger piles will be priced on a time accrued basis. We cannot dispose of any material with metal hardware. All of our material either gets chipped by us or a local recycling facility. Any metal embedded in the material will severely damage equipment.

More Questions?

At Green Forest Tree Service, we want you to feel 100% comfortable before you schedule a service with us. If you have a question that we have not addressed, please give us a call at (303) 396-0500 or email We will do our best to give you a reply within 24 business hours.