Our Contact Information

Call us to receive an estimate for any of your tree care needs.


Phone   Address 
Main:   (760) 934-6142
Bishop: (760) 873-5014
PO Box 5007
Mammoth Lakes, CA 93546 



If you would like to email us, please complete the form below.  We will respond within 2 business days.  Please call us at (760) 934-6142 if you require more immediate assistance.

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Eastern Sierra Tree Service is a full service tree company that offers a range of services from care, maintenance, and removal.  All of our services are provided by respectful and skilled crew members and meet ISA Best Practices and ANSI  A300 standards for tree care .  We pride ourselves with quality work and clean up done in a safe, efficient and respectful manner.

Our Services Include:

  • Pruning – Pruning trees is similar to getting a tattoo. It’s permanent and when done poorly, it may cost a lot of money to fix it or have it removed, you need to know why your doing it in the first place and it is important to make sure the person doing it knows what they are doing. Pruning methods have come a long way in the last few decades, learn more about how we can help you with your pruning needs here.
  • Tree Removal – We understand that your trees are a part of your landscape.  Removing a tree should cause minimal or no damage to the remaining landscape, driveways, fencing, lawn or sprinkler systems.  If you want it done without damage, give us a call. We offer full clean up and hauling of slash and logs.  If you prefer us to leave logs, rounds or firewood we can arrange that too. Learn more about our tree removal service’s here.
  • Tree Risk Assessment – Although there are no guarantees that your tree is safe – even healthy trees can fail, tree risk assessment can identify and evaluate trees that are a hazard or at risk for failure.   This cost effective evaluation can identify structurally unsound trees or tree parts, potentially saving you thousands of dollars due to damage and injury and could prevent the loss of the tree. Learn more on our Tree Risk Assessment page.
  • Tree Management
  • Stump Grinding
  • Cabling and Guying
  • Fuels Reduction
  • Lot Clearing
  • Emergency Tree Service
  • Storm Clean Up

Call the right people.

Not all tree contractors are created equal. Before you hire a tree service contractor, make sure they are properly licensed and insured.  You can read our article Hiring a Tree Service Contractor for more information about licensing and insurance requirements.

Eastern Sierra Tree Service has been serving the Eastern Sierra for over 30 years offering professional and qualified tree care.   Call us at 760 934-6142  or in Bishop 760 873-5014,  for a free estimate at your property.

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About Eastern Sierra Tree Service

Professional Tree Care.

Eastern Sierra Tree Service is a fully insured, bonded, and licensed tree service company providing California’s Eastern Sierra and Owen’s Valley with full service tree care and removal for over 30 years. Owned and operated by Bill Ossofsky, and Rochelle Hair we offer clients competent and safe tree removal, trimming and care using efficient and respectful methods.

Each member of our staff has received training in safety regarding job site, equipment operation, tree work and emergency. We are respectful of your property as well as the wildlife, people and staff that may interact with tree work. Our highly skilled staff has extensive experience with tree removal, pruning and trimming, lot clearing, cabling and stump grinding. We specialize in urban forestry and are experts in tree assessment, hazard and large tree removal near structures.

Your property, how can you make sure you have the best?

All we do are trees so we are experts in tree care and removal. Trust the care of your trees and property to someone providing care, maintenance and removal of trees near building every day. All of our services are provided by experience and skilled crew members. We are members in good standing with International Society of Arboriculture (ISA),Tree Care Industry Association (TCIA), California Association of Tree Trimmers and Landscapers (CATTLand) as well as local Chamber of Commerce. We pride ourselves with quality work and clean up done in a safe, efficient and respectful manner. You will not find anyone in the Eastern Sierra with more technical experience in trimming and removal than our crew.

Protect your investment.

Eastern Sierra Tree Service has two ISA Certified Arborists on staff. Hiring an arborist will insure that your trees receive the best care using the most modern tree care methods. Arborculture practices have changed significantly in the last 15 years. Practices once thought of as appropriate are now known to cause harm to trees. By hiring a ISA Certified Arborist in current standing you are insuring that you are having your trees cared for by professionals using modern methods.

Eastern Sierra Tree Service is a licensed tree service with the required license from CAL FIRE to remove trees on private forested lands. Please visit our ‘Questions You Should Ask’ page for more information on licensing permits and insurance required for tree work.

Insurance Certification or Additional Insured is available on request.

ISA Certified Arborist WE-9413A Rochelle Hair
California Contractor License #814516  D49 Tree Service & B General
CDF Timber Operator License #B9680
Mammoth Lakes Business #6057
Bishop Business License #3326
Mono County Business License #2714
Contractors Bond $12,500
$1M/ $2M Commercial Liability
$1M/ $2M Comm. Auto & Equip.
Workman’s Compensation

Contact us.

Call us to get a free estimate at your property:
Mammoth:   (760) 934-6142
Bishop:         (760) 873-5014
Or visit our Contact page to send us an email.
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“Expert Friendly Tree Service” 5 Stars “Bill and the crew of Eastern Sierra Tree Service did a fantastic job of tricky and high liability tree removal and trimming at my home in Mammoth Knolls. Super friendly, easy to work with, professional, knowledgeable, with great advice. They were recommended to me by every contractor as the best company to do the job. Very fair, competitive price, super cleanup, left nothing undone, even carved great backyard log benches from the cut tree trunks, and a good couple stacks of firewood. Highly recommended. Excellent service. I will definitely hirer them again as needed.” -Grant


Eastern Sierra Tree Service strives to provide 5 star service and professional workmanship.  Please take a moment to share  your opinion of our work.   Please email us or go to our business listing at Google.com.

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