Waukesha County

April 19 - 28, 2023*
Stay tuned for details

Earth Week Activities and Programs 


*All Month Long!
Friday, April 1 - Saturday, April 30

Open Daily, sunrise to 10 p.m.
Retzer Nature Center

Story Hike
Sponsored by Retzer Nature Center and Bridges Library System
(Recommended for all ages)

Come out to Retzer to enjoy this Spring’s Story Hike, featuring the children’s book “Begin with a Bee” by Liza Ketchum. This Story Hike is provided through a partnership with Retzer Nature Center and Bridges Library System. Set out on a self-guided hike on the Orange Trail to read the book while enjoying the outdoors at the same time! The Orange Trail is a mowed grass trail with some sloped terrain (approximately .75 mile). 

Free. No registration is necessary! Learn more!

Monday, April 18
6:30 - 7:30 p.m.
Retzer Nature Center

'A Wealth of Nature' Photo Presentation by Eddee Daniel
(Recommended for ages 8+)

Learn about all the amazing opportunities to enjoy nature and green spaces in Waukesha County and Southeast Wisconsin at this stunning visual program from local photographer and writer, Eddee Daniel. Our six-county region has an abundance of adventures and natural gems. Find out where they are and how you can help preserve and protect them. Learn more at awealthofnature.org. 

Free. Register by Friday, April 15 (Pre-registration encouraged, but not required.)

Tuesday, April 19
9:00 - 11:00 a.m.
Muskego Park
Habitat Restoration Workday & Wildflower Hike
(Recommended for ages 8+)

Work with our staff and volunteer Site Stewards to remove invasive garlic mustard from sensitive natural areas within Muskego Park. Staff will identify wildflowers during this workday and showcase the beautiful spring wildflower display within the park.

Free. Register by Friday, April 15

Wednesday, April 20
10 a.m. or 4 p.m.
Retzer Nature Center

Outdoor Classroom: Spring Wildflowers
(Recommended for ages 5-12 and their guardians)

Join us as we look for colorful signs of spring – flowers! We will focus on using our observation skills to look for new spring wildflowers, often called Spring Ephemerals. We’ll learn about these flowers' cool adaptations that help them survive and grow.

$4/student. Register by Tuesday, April 19

Wednesday, April 20
7:30 - 8:45 p.m.
Horwitz-DeRemer Planetarium
Sunset Meditation Planetarium Show & Night Hike
(Recommended for ages 10+)

Come unwind under the dome of the Horwitz-DeRemer Planetarium and meditate for your mental health! View a planetarium show of an amazing sunset as you travel from the Grand Canyon to the North Pole, then relax under a night sky filled with stars with glimpses of the Northern Lights. After the show, take a quiet hike with a naturalist and discover the tranquil sights and sounds of Retzer Nature Center.

$10/person. Register by Tuesday, April 19

Friday, April 22
7 - 10 a.m. 
Retzer Nature Center

Morning Bird Hike with the Benjamin Goss Bird Club
(Recommended for ages 8+)

This 1.5-mile easy hike is a great opportunity to learn about the birds found in Waukesha County and how they fit into our environment, habitat and county. No expertise is needed and all skill levels are welcome. Bring your own binoculars or borrow ours (limited quantity): cameras are also welcome. The hike is held rain or shine, so dress for the weather and meet in the parking lot area nearest to the Learning Center building.

Free. No registration is necessary! www.gossbirdclub.org

Friday, April 22 *CANCELED* due to weather conditions
7- 9 p.m.
Retzer Nature Center

Earth Day Candlelight Hike *CANCELED* due to weather conditions
(Recommended for all ages)

*CANCELED* due to weather conditions. Candles will light your way through the self-guided trail route (approximately one mile in length). Event will be held rain or shine, so dress for weather conditions. Dogs are not allowed at Retzer Nature Center.

Free. No registration is necessary!

Friday, April 22 *CANCELED* due to weather conditions
8 p.m.
Horwitz-DeRemer Planetarium

Public Sky Watch *CANCELED* due to weather conditions
(Recommended for ages 10+)

*CANCELED* due to weather conditions. See stars, planets, the moon, nebulae, star clusters, and galaxies! Learn how to use a telescope and binoculars. Our telescopes will be available or feel free to bring your own. This is a weather-permitting and clear sky event.

Free, donations accepted. Learn More!

Friends of Retzer Nature Center's Earth Week Celebration Event

Saturday, April 23
9 a.m. - 2 p.m.
Retzer Nature Center 
Horwitz-DeRemer Planetarium

Friends of Retzer Nature Center's
Earth Week Celebration Event
(Recommended for young children and families)

Come celebrate Planet Earth with us at Retzer Nature Center!

  • 9 a.m. - Noon: Mission Possible at Retzer (details below)
  • 9 a.m. - Noon: Discovery Trail Adventures - nature discovery, community art project, native plants and more!
  • 10 a.m. - 1:30 p.m.: Planetarium Shows (Advanced ticket registration recommended)
  • 10 a.m. - 1 p.m.: Recycling Exhibit Open House
    • Explore how your actions matter
    • Sort recyclables at the Materials Recovery Facility area

Free. No registration is necessary!

Mission Possible Volunteer Workday for the Earth

Saturday, April 23
9 a.m. - Noon
Choose your park location: 

  • Menomonee
  • Minooka
  • Mukwonago
  • Muskego
  • Retzer Nature Center

Mission: Possible Volunteer Workday
(Recommended for ages 13+ at parks, recommendation for families with young children at Retzer)

We need you for a top-secret mission! Help restore our Earth. We can take care of the planet and our County, but we need YOUR help! 

Free. Register by Thursday, April 21

Learn More!

Arbor Day Volunteer Tree Planting  
Friday, April 29
9 a.m. - Noon
Minooka Park
Arbor Day Volunteer Tree Planting
(Recommended for ages 10+)

Plant trees with Waukesha County Parks by joining this annual volunteer tradition! Celebrate Arbor Day and make a difference in your community by planting native trees to enhance and preserve our natural areas. Together our actions go further!

Free. Register by Wednesday, April 27. Learn More!


Retzer Nature Center
S14 W28167 Madison St., Waukesha, WI 53188
General Information: (262) 896-8007
Environmental Learning Center Hours: 8:00 a.m. - 4:30 p.m. (Mon.-Fri.); 10 a.m. - 3 p.m. (Saturday); Closed (Sunday)
Retzer Nature Center Ground Hours: Sunrise - 10:00 p.m. (Year-Round)

There is no daily entrance fee at Retzer Nature Center