Wisconsin Chapter

Welcome to the Sierra Club - Wisconsin Chapter.

We are Wisconsin's voice for the nation's oldest, largest and most influential grassroots environmental organization. Our members include 18,000 of your friends and neighbors. Inspired by Wisconsin’s beautiful lakes, forests, rivers, and other natural features, we work together to protect our communities and the planet.

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Looking to take action on the most pressing issues in Wisconsin? 
Check out our Action Center!

Make a Difference for Wisconsin's Future!

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and...Line 5 is out!
X Trespassing on Tribal Land
X Jeopardizing the Great Lakes
X Responsible for largest spill in Wisconsin history
 
Tell Governor Tony Evers - Line 5 strikes out
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Each year the Chapter recognizes volunteers and community members for outstanding service and accomplishments on behalf of Wisconsin’s environment. At a time when the journey toward a sustainable future seems daunting, it is inspiring to be reminded of all the impactful work being done, often behind the scenes, to make our world a better place. Each of these recipients is making a difference in their own, unique way.

You can hear their uplifting stories during our annual, online awards event on Tuesday, November 17 at 6 p.m.

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The Sierra Club created this toolkit to help Wisconsinites understand what hyperscale data centers are, what impacts they have, and what local communities and concerned citizens can do to mitigate the worst impacts.
 

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Donate today to keep Sierra Club's essential advocacy moving forward!

Click here to donate 

 

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WE DID IT  🐟 - 86,262 Fish!
Thanks to the creativity and dedication of people around the world, we've broken the record for the largest display of origami fish — over 86,000! Each fish is a symbol of shared commitment to protect the Great Lakes.

Photo credit: Devon Young Cupery

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Volunteer with the Sierra Club and make a difference today! Check out our volunteer page to learn more! 

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Donate your car, truck, cycle, RV or boat to the Sierra Club Foundation and select Wisconsin Chapter to benefit from your gift.

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Local News and Information

Announcing our 2026 Sierra Club Chapter Award Winners

October 26, 2026
The Sierra Club Wisconsin Chapter is excited to announce the 2026 Chapter Award recipients. Each year the chapter recognizes volunteers and community members for outstanding service and accomplishments on behalf of Wisconsin’s environment. At a time...
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