Here is a "Signs of Spring" Calendar for Late March that I have put together.
• Chipmunks emerge from underground winter sleep.
• March 20th – Vernal Equinox. The first day of spring. Day and night are equal in length.
• Look for flights of returning migratory ducks in your local freshwater wetlands and ponds. Ring-necked ducks, Green-winged teal, Wood ducks, Black ducks, and mallards are all heading to their breeding grounds.
• Salamander migration begins on the first warm, rainy night. Watch for them crossing roads in wooded areas.
• Pussy willows are fuzzed out about now.
• Listen for family, friends, relatives, and neighbors to say their favorite weather or nature proverb.
• March 21st. Saturn makes its closest approach to the earth tonight.
• March 29th. Full moon. The Sap moon.
• March 28th Sunrise 6:34AM Sunset 7:06PM Length of Day 12 hours 32 minutes
• The winter constellations are moving westward. Watch for the last days of Orion and Pleiades.
• On warm days and nights, listen for the soft, ducklike “quack” call of Wood frogs from vernal pools in wooded areas.
• Willow branches start turning green.
• On sunny days, watch for early garter snakes in sunny locations around rocks and rubble, near grasses.
• Red maples bloom; look for the reddish haze in wooded swamps.
I have modeled this after, and drawn heavily from, Mass. Audubon's Monthly Calendar in their Sanctuary magazine.
Here is a link to Mass Audubon's Outdoor Almanac. found on their website.