| Environmental Date |
Date(s) |
| National Bird Day | January 5 |
| International Zebra Day | January 31 |
| World Wetlands Day | February 2 |
| World Ostrich Day[3][4] | February 2 |
| World Marmot Day[5][6]
| February 2 |
| World Pangolin Day[7][8] | Third Saturday of February |
| World Whale Day[9] | Third Sunday of February |
| World Bonobo Day[10][11][12] | February 14 |
| World Lizard Day[13][14] |
February 8 |
| World Hippopotamus Day[15] | February 15 |
| International Polar Bear Day | February 27 |
| World Wildlife Day | March 3 |
| International Day of Action for Rivers | March 14 |
| World Consumer Rights Day | March 15 |
| Buzzards Day[16][17] | March 15 |
| Digital Cleanup Day[18] |
March 15, 2025 |
| National Panda Day[19][20][21] | March 16 |
| Global Recycling Day[22] | March 18 |
| World Serval Day[23] |
March 18 |
| Taxonomist Appreciation Day[24] | March 19 |
| World Sparrow Day | March 20 |
| World Frog Day[25][26][27] | March 20 |
| World Rewilding Day[28] | March 20 |
| International Day of Forests | March 21 |
| World Planting Day[29][30][31] | March 21 |
| World Wood Day[32] | March 21 |
| World Water Day | March 22 |
| International Seal Day[33] | March 22 |
| World Meteorological Day | March 23 |
| International Day of Zero Waste[34] |
March 30 |
| World Aquatic Animal Day[35] | April 3 |
| World Rat Day[36][37][38] | April 4 |
| International Beaver Day[39][40] | April 7 |
| Zoo Lovers Day[41][42] | April 8 |
| Arbor Day | April 26 |
| Bat Appreciation Day[43][44] | April 17 |
| Earth Day | April 22 |
| International Pallas's Cat day[45][46][47] |
April 23 |
| World Day for Laboratory Animals | April 24 |
| World Tapir Day[48][49][50] | April 27 |
| International Hyena Day[51][52] |
April 27 |
| Day of Remembrance for all Victims of Chemical Warfare | April 29 |
| Green Up Day | First Saturday of May in Vermont |
| World Tuna Day[53][54][55] | May 2 |
| International Leopard Day[56][57][58] | May 3 |
| Wild Koala Day[59][60] | May 3 |
| Greenery Day | May 4 in Japan (previously April 29) |
| World Donkey Day[61] | May 8 |
| Go Public Gardens Days[62] | Friday before to the Sunday after Mother's Day |
| World Migratory Bird Day[63] | Second Saturday of May. Second Saturday of May in the U.S. and Canada; Second Saturday of October in Mexico, Central and South America, and the Caribbean. |
| World Binturong Day[64] | Second Saturday of May. |
| Endangered Species Day[65] | Third Friday of May |
| International Toad Day | May 15 [66] |
| Bike-to-Work Day | Third Friday of May |
| World Bee Day | May 20 |
| International Day for Biological Diversity (World Biodiversity Day) | May 22[67] |
| World Turtle Day | May 23 |
| Taxonomy Recognition Day | May 23 |
| European Day of Parks – Europarc Federation[68] | May 24 |
| World Otter Day[69] | last Wednesday of May |
| World Dugong Day[70][71] | May 28 |
| Black Birders Week | May 29 |
| World No Tobacco Day | May 31 |
| World Parrot Day[72][73][74] | May 31 |
| World Reef Day[75][76] | June 1 |
| World Peatlands Day | June 2 |
| World Bicycle Day[77] | June 3 |
| World Environment Day | June 5 |
| Solomon Memorial Day | June 5 |
| World Oceans Day | June 8 |
| Coral Triangle Day | June 9 |
| International Lynx Day[78][79] | June 11 |
| National Cougar Day[80] | June 12 |
| Global Wind Day | June 15 |
| World Sea Turtle Day[81] | June 16 |
| World Day to Combat Desertification and Drought | June 17 |
| World Croc Day[82] | June 17 |
| World Horseshoe Crab Day[83][84] | June 20 |
| World Giraffe Day | June 21 |
| World Camel Day[85][86][87] | June 22 |
| World Rainforest Day[88][89] | June 22 |
| Black Birders Week[90] | June 24 |
| World Decarbonisation Day | June 25 |
| World Population Day | July 11 |
| Shark Awareness Day[91][92][93][94] | July 14 |
| World Chimpanzee Day[95][96][97] | July 14 |
| World Orca Day[98] |
July 14 |
| World Snake Day[99] | July 16 |
| Earth Overshoot Day | Advanced to July 24 in 2025[100] |
| International Day for the Conservation of the Mangrove Ecosystems | July 26 |
| World Nature Conservation Day[101][102][103] | July 28 |
| International Tiger Day | July 29 |
| World Ranger Day – International Ranger Federation | July 31 |
| International Clouded Leopard Day[104] | August 4 |
| World Tomistoma Day | August 5 |
| International Moon Bear Day | August 8 |
| World Lion Day[105] | August 10 |
| World Elephant Day | August 12 |
| World Hirola Day[106] | August 12 |
| International Wolf Day[107][108] | August 13 |
| National Honey Bee Day (US only) | August 15 |
| Scimitar-Horned Oryx Day[109][110] | August 16 |
| World Orangutan Day[111] | August 19 |
| World Mosquito Day | August 20 |
| World African Wild Dog Day[112] | August 26 |
| International Whale Shark Day[113][114] | August 30 |
| World Beach Day, aka National Beach Day[115] | September 1 |
| International Primate Day[116] |
September 1 |
| Japan Dolphin Day[117][118] | September 1 |
| Amazon Rainforest Day[119] | September 5 |
| International Vulture Awareness Day[120][121][122] | First Saturday of September |
| International Day of Clean Air for blue skies | September 7 |
| World Dolphin Day[123] | September 12 |
| International Colugo Day[124] |
September 15 |
| International Day for the Preservation of the Ozone Layer | September 16 |
| World Manta Day[125] |
September 17 |
| World Water Monitoring Day | September 18 |
| PARK(ing) Day [de][126][127][128] | Third Friday in September |
| World Cleanup Day[129] | September 16, 2023, Third Saturday in September |
| National Cleanup Day[130] | September 18, 2021, Third Saturday in September |
| International Red Panda Day[131] | Third Saturday of September |
| Zero Emissions Day[132] | September 21 |
| World Dates Day | September 22 |
| World Rhino Day[133] | September 22 |
| World Gorilla Day[134][135][136] | September 24 |
| World Environmental Health Day[137] | September 26 since 2011 (IFEH)[138] |
| World Cassowary Day[139][140] | September 26 |
| International Day of Awareness of Food Loss and Waste[141] | September 29 |
| World Rivers Day[142] | Last Sunday of September |
| Australian Wildlife Week[143] | First Week of October |
| International Raccoon Appreciation Day[144] | October 1 |
| World Farm Animals Day[145] | October 2 |
| World Habitat Day | First Monday of October |
| World Animal Day | October 4 |
| National Badger Day[146][147][148] | October 6 |
| World Octopus Day[149][150][151] | October 8 |
| Mazingira Day | October 10 [152] |
| Energy Efficiency Day[153] | First Wednesday in October |
| International Day for Natural Disaster Reduction | October 13 |
| International E-Waste Day[154][155][156] | October 14 |
| International Sawfish Day[157] | October 17 |
| Stepping Stone Day[158] | October 17 |
| Sustainability Day![159] | Fourth Wednesday of October |
| World Okapi Day[160][161] | October 18 |
| International Sloth Day[162][163][164] | October 20 |
| National Reptile Awareness Day[165][166] | October 21 |
| World Earthworm Day[167][168] | October 21 |
| International Wombat Day[169][170][171] | October 22 |
| International Snow Leopard Day[172][173] | October 23 |
| Freshwater Dolphin Day[174] | October 24 |
| International Gibbon Day[175][176][177] | October 24 |
| International Day of Climate Action | October 24 |
| World Lemur Day[178][179] | Last Friday of October |
| World Ecology Day[180] |
November 1 |
| World Vegan Day | November 1 |
| World Basking Shark Day | November 3 |
| International Day for Preventing the Exploitation of the Environment in War and Armed Conflict | November 6 |
| National Bison Day | First Saturday in November |
| America Recycles Day | November 15 |
| World Fisheries Day[181] | November 21 |
| International Jaguar Day[182][183] |
November 29 |
| International Cheetah Day[184][185] | December 4 |
| Wildlife Conservation Day[186] | December 4 |
| World Soil Day[187] | December 5 |
| International Mountain Day | December 11 |
| Monkey Day | December 14 |
| Ozone Action Day | Variable date depending weather conditions |
| eDay – Electronic Waste Day | Variable date, in New Zealand |
| World Fish Migration Day |
Variable date (next one - 23 May 2026)[188] |