January
- 5National Bird Day
- 10Houseplant Appreciation Day
- 20Take a Walk Outdoors Day
- 21Squirrel Appreciation Day
- 24Mobile Phone Recycling Day
- 26International Environmental Education Day
- 28Reducing CO2 Emissions Day
February
- 2World Wetlands Day
- 15World Hippo Day
- ~15World Whale Day (third Saturday of February)
- 27International Polar Bear Day
March
- 3World Wildlife Day
- 12Plant a Flower Day
- 18Global Recycling Day
- 21International Day of Forests
- ~22Earth Hour (the fourth Saturday of March)
- 22World Water Day
- 23World Bear Day
April
- 3World Aquatic Animal Day
- 7International Beaver Day
- 14National Gardening Day
- 22Earth Day
- ~24Stop Food Waste Day (last Wednesday in April.)
- ~25Arbor Day (last Friday of April)
May
- 4Greenery Day
- ~9National Public Gardens Day (second Friday in May)
- ~10World Migratory Bird Day (the Second Saturday in May)
- ~16Endangered Species Day (third Friday in May)
- ~16Bike to Work Day (third Friday in May)
- 20World Bee Day
- 22International Day for Biological Diversity
- 23World Turtle Day
- 29Learn About Composting Day
June
- 1World Reef Awareness Day
- 5World Environment Day
- ~7National Trails Day (first Saturday in June)
- 8World Ocean Day
- 15Global Wind Day
- 21Show Your Stripes Day
- 21National Indigenous Peoples Day
- 22World Rainforest Day
- 24Upcycling Day
July
- 3International Plastic Bag Free Day
- 10Global Energy Independence Day
- 14National Be Nice to Bugs Day
- 26International Day for the Conservation of the Mangrove Ecosystem
- 28World Nature Conservation Day
- 29International Tiger Day
August
September
- ~20World Cleanup Day (third Saturday of September)
- 21Zero Emissions Day
- 22World Rhino Day
- ~28World Rivers Day (fourth Sunday of September)
- 29International Day of Awareness of Food Loss and Waste
October
- 1World Vegetarian Day
- 4World Animal Day
- 14International E-Waste Day
- 21National Reptile Day
- 31World Cities Day
November
- 1World Vegan Day
- 15National Recycling Day
- ~29Buy Nothing Day (the day after American Thanksgiving)
