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Maricopa County Parks and Recreation: Usery – Invasive Species Removal

Usery Mountain Regional Park 3939 N. Usery Pass Rd., Mesa

Desert Defender volunteers needed! Join us in removing invasive species and reducing the wildfire risk in Maricopa County Regional Parks. Participants will learn to identify several invasive species, their phenology and characteristics, and how to remove these invasive plants effectively.  Meet at the Nature Center. The goal is to remove invasive plants as a proactive...

Free with Park Fee

Maricopa County Parks and Recreation: Estrella – Earth Day Desert Defenders Event

Estrella Mountain Regional Park 14805 W. Vineyard Ave., Goodyear

This hands-on event features a variety of fun and meaningful projects—perfect for anyone who enjoys getting their hands dirty (or wearing gloves!). Earth Day – Desert Defenders Event at Estrella Mountain Regional Park Join us on this Earth Day at Estrella Mountain Regional Park on April 22, 2026, from 7:00 AM to 10:30 AM. We’ll meet at the Nature Center parking lot....

Free with Park Fee

Maricopa County Parks and Recreation: White Tank – Invasive Species Removal

White Tank Mountain Regional Park 20304 W. White Tank Mountain Rd., Waddell

Desert Defender volunteers needed! Join us in removing invasive species and reducing the wildfire risk in Maricopa County Regional Parks. Participants will learn to identify several invasive species, their phenology and characteristics, and how to remove these invasive plants effectively.  Meet at the Area 4 Parking Lot. The goal is to remove invasive plants as...

Free with Park Fee

Maricopa County Parks and Recreation: McDowell – Invasive Species Removal

McDowell Mountain Regional Park 16300 McDowell Mountain Park Dr. MMRP, Fountain Hills

Desert Defender volunteers needed! Join us in removing invasive species and reducing the wildfire risk in Maricopa County Regional Parks. Participants will learn to identify several invasive species, their phenology...

Free with Park Fee

Greater Phoenix City Nature Challenge 2026: Acts of Science – Connected − Earth Day Animal Spot-A-Thon

Online

Help NASA-supported researchers study wildlife conservation from wherever you are. All you need is curiosity. Featured Project: Snapshot Wisconsin During this virtual event, you’ll explore trail camera photos and classify the animals you see to help track changes in wildlife that informs wildlife management and conservation decisions. Hear from the project scientists, ask questions, and discover...

Free

Arizona State University: Earth Day Stadium Walk 2026

Mountain America Stadium 500 E. Veterans Way, Tempe

Join University Sustainability Practices and SRP for the free ASU Earth Day Walk at Mountain America Stadium. This unique celebration of sustainability includes a three lap walk around the stadium and sustainability partner tabling fair located in the stadium at the Coca Cola Sun Deck, to learn about sustainability, enjoy light snacks, play games and...

Free

Children’s Museum of Phoenix: Earth Day Expo

Children's Museum of Phoenix 215 N. 7th St., Phoenix

Join us in the Children’s Garden for fun and educational outdoor activities in celebration of Earth Day! Wednesday, April 22nd from 9am-1pm. HANDS-ON PROGRAMS INCLUDE: Compost Corner – Explore the world of worms and roly-polies and build your own compost container to learn about how composting works Seed Bombs – Make a wildflower seed bomb to take...

Free with Admission

Maricopa County Parks and Recreation: City Nature Challenge Practice Hike

Estrella Mountain Regional Park 14805 W. Vineyard Ave., Goodyear

Learn about the April 24-27 City Nature Challenge and free smartphone apps that can help you identify plants, animals, and more, while helping contribute to science!   Join Ranger Eric on a short, easy walk between the Nature Center and the Quail Trailhead while we learn about the free iNaturalist app you can use to identify...

Free with Park Fee

Earth Day 2026: The future we build

Rob and Melani Walton Center for Planetary Health (Walton Center) 777 E. University Dr., Tempe

The Julie Ann Wrigley Global Futures Laboratory® invites you to celebrate Earth Day by exploring the future we build. Since 2021, GFL has served as Arizona State University’s hub for Earth Day. This year, we will celebrate Earth Day featuring an afternoon designed to connect our community, spark ideas and showcase pathways to a thriving planet. Starting...

Free

Earth Day 2026: The future we build

Rob and Melani Walton Center for Planetary Health (Walton Center) 777 E. University Dr., Tempe

The Julie Ann Wrigley Global Futures Laboratory® invites you to celebrate Earth Day by exploring the future we build. Since 2021, GFL has served as Arizona State University’s hub for Earth Day....

Free

Arizona State University: Earth Day 2026 – The Future We Build

Rob and Melani Walton Center for Planetary Health 777 E. University Dr., Tempe

The Julie Ann Wrigley Global Futures Laboratory® invites you to celebrate Earth Day by exploring the future we build. Since 2021, GFL has served as Arizona State University’s hub for Earth Day. This year, we will celebrate Earth Day featuring an afternoon designed to connect our community, spark ideas and showcase pathways to a thriving planet. Starting...

Free

Maricopa County Parks and Recreation: Discovery Station – Be a Citizen Scientist!

Usery Mountain Regional Park 3939 N. Usery Pass Rd., Mesa

Stop by an information table where Ranger Kevin will teach you how to use your phone to identify and document your nature findings to help the scientific community.   Ranger Kevin will host a drop-in information table to get you on your way to becoming a Citizen Scientist using the free iNaturalist app that identifies and...

Free with Park Fee

Mesa Public Library: Citizen Science – Earth Day Animal Spot-a-thon

Mesa Public Library - Red Mountain Branch 635 N. Power Rd., Mesa

Help scientists identify as many animals as possible in camera trap images. This event is a part of "Acts of Science: Connected," which will bring us all together in April to celebrate participation in real research for Citizen Science Month! SciStarter is aiming toward a shared goal of 2.5 million acts of science by the...

Free

Mesa Public Library: Earth Day Animal Spot-A-Thon

Mesa Public Library - Gateway Branch 5036 S. Eastmark Pkwy., Mesa

Celebrate Earth Day by helping scientists monitor wildlife! In this hands-on event, you’ll explore trail camera photos and help classify the animals you see. Your contributions support a NASA-supported research project that tracks changes in wildlife distributions and abundances over time—critical data that informs wildlife management and conservation decisions. This Citizen Science event is a...

Free

Mesa Public Library: Walk-in Wednesday presents – Earth Day Animal Spot-A-Thon

Mesa Public Library - Main Branch 64 E. First St., Mesa

This is a live, interactive Acts of Science connected event delivered by scientists and SciStarter educators. Featured Project Participants will identify animals in camera-trap images from real wildlife research projects. These observations help scientists monitor biodiversity and support conservation research worldwide. Participants will contribute to real research in real time, guided throughout the session, and...

Free

Mesa Public Library: Mason Jar Beehives for Earth Day

Brady Park 7045 E. Monterey Ave., Mesa

Celebrate Earth Day with a creative, hands-on activity! Kids will make their own Mason Jar Beehives while learning why bees are so important to our planet. This craft introduces young learners to pollinators, plants, and simple ways they can help protect the environment. Participants will take home their beehive creation along with ideas for supporting...

Free

Maricopa County Library District: Fearless Kitty Rescue

MCLDAZ - Fountain Hills Branch 12901 N. La Montana Dr., Fountain Hills

Learn of the great work performed by Fearless Kitty Rescue in our community. Support their efforts by making upcycled cat toys.

Free

Arizona State University: Water Scarcity and Innovation – Lessons from the U.S. Southwest and Germany

Rob and Melani Walton Center for Planetary Health 777 E. University Dr., Tempe

Join us for a timely discussion on one of the most pressing challenges of our time: water scarcity and its evolving economic implications. This moderated panel will bring together leading voices from policy, academia, and industry to explore how water stress is not only reshaping economic risk, but also driving innovation, investment, and new market...

Free

Desert Foothills Land Trust: 35th Anniversary Celebration

Sanderson Lincoln Pavilion 101 Easy St, Carefree

Help us celebrate 35 years of conservation success at our Earth Day Fundraising Dinner!​ ​ Mark this milestone with an evening of exceptional food, music, and community as we honor more than 1,100 acres of protected desert land—with even more conservation on the horizon. ​ Evening Highlights: Delicious sit-down dinner prepared by Chef Tony Rea's Creation...

$250