Complete 2026 Guide to Choosing the Right Arborist
Finding a reliable Denver tree service should not feel like navigating a maze of Google results, conflicting reviews, and vague pricing. After working with Denver homeowners for almost five decades and maintaining thousands of trees across the metro area, Ross Tree has seen what sets exceptional tree care apart from less-credentialed companies. The blog below acts as a guide that cuts through the sales and marketing noise to help property owners make an informed decision about hiring a Denver tree service company.
What Makes Denver Tree Care Different From Other Parts of the Country
Denver’s unique climate creates specific challenges that national chains and inexperienced companies often overlook. Tree companies need to know the difference between drought stress, disease, and tree insect damage, understand how Denver’s clay soil affects nutrient uptake, and recognize species-specific issues like Cytospora, Emerald Ash Borer, Ips Engraver, and Thyronectria cankers. They also need to recognize when unexpected fungal diseases reappear in Denver. For example, the Dutch Elm disease reappeared in Denver three years ago after an unusually wet summer. Sudden polar plunges can happen in the fall or spring, killing or severely damaging trees. Droughts can occur in Colorado during the summer or winter. A qualified Denver tree service company understands the challenges trees have growing here.
How to Evaluate Denver Tree Service Companies
Credentials Actually Matter
When researching Denver tree services, property owners will encounter impressive-sounding certifications and vague claims about “expert arborists.” Here is what actually indicates competence:
ISA Certified Arborists have passed rigorous examinations on tree biology, diagnosis, maintenance practices, and safety. Acquiring an ISA certification is not a weekend program—it requires documented experience and continuing education. People looking for ISA-certified expertise in Metro Denver can click here to verify status.
Licensed and Insured is usually assumed, but homeowners need to know that many tree companies operate without proper coverage. In Colorado, tree care businesses must be licensed, and legitimate companies carry both general liability and workers’ compensation insurance. Request proof before any work begins. If a worker is injured at a residence, and the company lacks workers’ comp, the homeowner could be liable.
Longevity in the Denver market. Fly-by-night operations often underbid established companies, perform substandard work, and vanish when problems emerge. A decade or more of serving the Denver area demonstrates accountability. Check whether the companies have good reviews on BBB, Google Business Profile, and Yelp. For more assurance, see if the company is listed on Denver Forester’s Licensed Tree Contractor List.
Red Flags
Certain warning signs should immediately disqualify a Denver tree service from consideration:
Door-to-door solicitation after storms is the classic sign of storm chasers. Legitimate, established companies do not cruise neighborhoods looking for damaged trees. Storm chasers or guys with a truck and a ladder provide the lowest bid, do fast, dangerous work, and disappear before homeowners discover any problems.
Stubbing and haphazard cutting of branches are considered malpractice under arboricultural standards. It creates weak regrowth and unsightly trees. Companies that recommend these types of pruning are amateurs. Remember, a lawn can be replaced in one season. A tree trimmed incorrectly can take years to heal, if at all.
Quotes over the phone or by text, without a site inspection, mean the company is guessing. Professional tree assessment requires examining the tree’s condition, access constraints, overhead utilities, nearby structures, and growing conditions. Legitimate tree companies always conduct on-site evaluations.
The lowest bid by a significant margin usually means the company is cutting corners. Professional tree work requires expensive equipment, trained crews, comprehensive insurance, and proper debris disposal. Companies that dramatically underbid competitors are best avoided.
Tree Health and Treatment Services
Control product applications depend on the mating cycles of each tree insect and when adults emerge to find other host trees. Trained and licensed arborists and quality supervisors understand these cycles and treat trees accordingly. Simply spraying pesticides without proper identification at the wrong time wastes money and can harm beneficial insects such as bees. Some control products require licensing from the Colorado Department of Agriculture and require application by Quality Supervisors.
Emerald ash borer (EAB) treatment is a must now in Denver, since the iridescent beetle found its way to the city last year. Ash trees have no immunity, and if not treated, will eventually die as the insect spreads across the city. Professional treatment involves trunk spraying for Ash saplings and systemic insecticide injections for mature trees, administered every 1-2 years. Cost depends on tree size. Treatment only makes sense for young or mature trees growing in good locations. We recommend removing unhealthy trees or those growing near utility lines.
Iron chlorosis treatment addresses the yellowing leaves common in our alkaline soils. Maples are commonly affected in Denver. Professional treatment involves deep root injection of chelated iron. Foliar sprays provide minimal benefit compared to root treatment.
Cytospora and Thyronectria cankers attack Aspen and Honeylocust trees in Denver, respectively. There is no cure for either, but proper diagnosis prevents homeowners from wasting money on ineffective treatments. A knowledgeable Denver tree service will honestly assess whether treatment makes sense or if removal and replacement are the better choice. Watering Aspens and Honeylocust periodically is the best way to avoid these fungal diseases.
Deep-root watering and fertilization keep trees healthy. Their natural defenses can ward off disease and tree pests most of the time. Periodic watering and feeding of trees helps keep the doctor (tree companies) away.
How to Pick a Denver Tree Service
Landscapes with mature trees are living assets that increase property value, provide environmental benefits, and improve curb appeal and ambience. They deserve care from Denver tree service companies who understand our climate’s unique challenges, follow professional standards, and take a proactive approach to tree health care.
- Get Multiple Bids
Three bids from qualified companies give homeowners a good indication of the market price for the services requested. Picking the middle bid is not automatically the “right” choice. Homeowners should evaluate the entire proposal.
- Detailed Scope of Work
The scope of work should specify exactly what will be done. “Trim tree in backyard” is inadequate. “Crown thinning to reduce density by 20-25%, remove deadwood throughout canopy, raise lower limbs to 12-foot clearance, apply proper pruning cuts per ANSI A300 standards” shows professional knowledge.
- Timeline Commitments
Do not assume they can arrive on the week called; ask about scheduling before committing. Well-known established tree companies can be booked months in advance during the growing season; others can respond within weeks.
- Cleanup and Disposal
Cleanup should be part of the job, not extra. Reputable companies rake and clean the work area, leaving no wood chips, branches, or twigs scattered across your lawn.
- Stump Removal
Standard stump grinding goes 6-8 inches below grade, with the tree crew filling the hole with topsoil after the job is completed.
Check References and Online Presence
Before hiring any Denver tree service, verify their reputation:
BBB, Google Business Profile, and Yelp reviews show recent customer experiences. Focus on patterns rather than individual complaints. Every company gets occasional negative reviews, but multiple reports of poor cleanup, property damage, and incomplete work indicate systemic problems.
Project photos on social media or websites demonstrate the quality of the work. Before-and-after images should show proper pruning cuts, complete cleanup, and professional results.
Length of time in business appears on Google Business Profile and BBB pages. Newer companies are not necessarily bad, but established companies have longer track records, giving peace of mind when hiring.
Why Long-Term Tree Care Relationships Matter
Most successful Denver tree companies aim to establish long-term relationships with their customers. They want to earn the trust and respect of property owners. There are benefits to having a go-to tree service company. Their arborists know the property and will notice subtle changes in canopy density, bark condition, or growth patterns that indicate developing issues. Early intervention almost always costs less. Also, the homeowner trusts they will get a fair price, avoiding the time and effort to qualify another provider.
Ross Tree Company has served Denver’s urban forest for over 40 years with ISA-certified arborists, comprehensive insurance, and a track record of professional tree care that prioritizes trees’ long-term health. Please call (303) 871-9121 or click here to complete a request service form. Property owners, we want to earn your business.
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