Naturalist Field School (NFS) Registration Information

Age Guidlines

We offer classes for specific age groups so that our Educators can do the best job possible when teaching your kids and having fun with them. We are strict with the ages especially on the young side - when we say no 3 year olds in our week-long classes, we mean it. We love having your kids in our classes so help us do our job well by choosing appropriate age-specific classes we carefully designed. Together we can do best for your kids AND our Educators. Thank You! To register, click here.


Scholarship Opportunities

We pride ourselves in the ability to offer ACES programming to everyone. If you need financial assistance, click here for the scholarship application in English and click here for it in Spanish. Fill it out and send it to [email protected].


Cancellation Policy

We understand that plans can change and we try our best to work with you if you need to cancel a class:

  • FULL REFUND (less $20 cancellation fee) is given if the participant cancels at least TWO WEEKS PRIOR to the start of the class.
  • NO REFUNDS are given for cancellation within 14 DAYS PRIOR to the start of the class.
  • We will consider cancelation requests for family emergencies, illness, or accidents prior to the camp session start date for a full refund less a $20 cancellation fee. 
  • In the event that ACES has to cancel a class, full refunds will be issued (no additional fees).
  • There are NO REFUNDS for Hallam Lake Kids 5-punch pass - this pass is transferable.
  • MEMBERSHIP BENEFITS: ACES members receive discounts on all of our programs, not to mention that you support the great work we do in this community and beyond. Simple solution - become an ACES member now!


Medical Management Plan

Participants with specific medical needs and conditions must follow the below-described procedures so that ACES may determine if staff and resources can appropriately respond to participant’s needs/conditions. This requirement is not intended to be exclusionary. This Medical Management Plan is applicable for all ACES NFS program participants.

Adult participant/parent/legal guardian is required to provide a written medical management plan to ACES for any child or adult requiring specific medical care while participating in an ACES program. The medical management plan must be provided to Phebe Meyers, ACES Naturalist Field School Manager ([email protected]) no less than two weeks prior to the start of the program. Adult participant/parent/legal guardian and relevant ACES staff will review the plan together (via email, phone or in person) and address questions prior to the program start date. If adult participant/parent/legal guardian wishes to discuss the medical management plan again on the day of program, the participant/parent/legal guardian must schedule an appointment to start no later than 30 minutes prior to the start of the program.  

Click here for our medical management plan. 


Essential Eligibility Criteria

Aspen Center for Environmental Studies (ACES) Naturalist Field School Program’s mission is to educate for environmental responsibility. ACES NFS programs are one-day or multi-day field excursions and programs with the goal of inspiring environmental stewards. 

Our priorities are to provide high-quality programs and for the health and well being of our program participants and staff. ACES strives to provide age appropriate activities that depend on the specific details of the program. If you have questions about what you or your child will be doing, please email or call ACES for more information.

ACES works to accommodate a wide range of abilities in programs. ACES works to make reasonable accommodations with individuals and program leaders to create an accessible learning environment, when appropriate and feasible. 

All ACES Naturalist and Education staff have basic First Aid training. All lead educators in wilderness environments have either Wilderness First Aid or Wilderness First Responder training. ACES staff are trained to respond to basic medical emergencies in the context of ACES programming that they facilitate. You and your doctor are responsible to decide if you or your child can adequately participate in this program. 
Please review the criteria here.

If you have more questions on ACES Naturalist Field School (NFS), please email Phebe at [email protected] or call either of our field studies centers.