Patty Harris will hold 45-minute therapeutic and restorative classes from 7:30 a.m. to 1 p.m.
"We're going to be in this area where we're under trees and a part of nature," she said.
Harris said she's excited about the opportunity to teach a class in nature because of the extra space, which will allow yoga participants to enhance their movements and get the most out of the experience.
"What I'm hoping to accomplish is giving people access to yoga therapy in a way that is healing and basically therapeutic for them," she said.
Harris typically teaches hour-long classes, but even with a shortened schedule, she still plans on slowing things down for the class.
"A lot of yoga we find is fast-paced," she said. "This is more about slowing down and getting the benefit of the poses."
Morton Special Events Coordinator Gina Steele said Harris' class is one of several taking place during the morning activities. The arboretum is hosting community groups to come out and showcase what can be done in nature.
"We basically were just reaching out to the community," Steele said.
The event is also being held to promote outdoor activities people can do at the arboretum, including hiking, running and bike rentals.
All activities are free, but nonmembers will have to pay to get into the arboretum, Steele said.
A full list of classes and the schedule is available at www.mortonarb.org/events. Activities will go on rain or shine.