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Events for April 18, 2026

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arizona science center

Greater Phoenix City Nature Challenge 2026: Nature Observations 101 – Using iNaturalist for the Greater Phoenix City Nature Challenge

Arizona Science Center 600 E. Washington St., Phoenix

Do you like observing nature? Then help science and make your observations count! The City Nature Challenge is a friendly worldwide competition among cities to see whose residents can spot and identify the most wildlife. Join Arizona Science Center on April 18 to learn how to use the iNaturalist app, sharpen your observation skills, and...

Free with Admission
red rock state park

Arizona State Parks & Trails: Earth Day Celebration at Red Rock

Red Rock State Park 4050 Red Rock Loop Rd., Sedona

Join us on Saturday, April 18th from 10 a.m. to 2 p.m. for our annual Earth Day Celebration in Sedona's red rocks! FREE admission from 9:30 a.m. to 1:30 p.m.! This event features live wildlife presentations, nature hikes, booths, games, prizes, kids crafts, and much more! Learn from our community partners how we can all...

Free