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Signs of the Seasons: A New England Phenology Program

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Indicator Species

Click on the links below for more information about each indicator species.

Red maple,
Acer rubrum
Sugar maple,
Acer saccharum
Ruby-throated hummingbird,
Archilochus colubris
Common Milkweed,
Asclepias syriaca
Ascophyllum nodosum
Monarch butterfly,
Danaus plexippus
Forsythia sp.
Wild strawberry,
Fragaria virginiana
Common loon,
Gavia immer
Beach rose,
Rosa Rugosa
Common lilac,
Syringa vulgaris
Common dandelion,
Taraxacum officinale
American toad,
Anaxyrus americanus
American robin,
Turdus migratorius
Spring peeper, Pseudacris crucifer Wood frog,   Lithobates sylvaticus
Eastern white pine, Pinus strobus Common reed, Phragmites australis

Image Description: Print Friendly

Image Description: red maple leaves

Image Description: Sugar Maple leaves

Image Description: Ruby-Throated Hummingbird at Cardinal Flower

Image Description: Milkweed flowers

Image Description: Rockweed

Image Description: monarch butterfly

Image Description: Forsythia

Image Description: Wild strawberry

Image Description: common loon

Image Description: Beach Rose

Image Description: Common lilac

Image Description: Dandelion flowers and fruit

Image Description: AmericanToad_JWilson_USGS Savannah River Ecology Lab

Image Description: American Robin

Image Description: peeper2_jdwillson_SREL

Image Description: woodfrogadult

Image Description: Bugwood_WhitePine_StevenKatovich_USDA Forest Service

Image Description: Flower Heads (inflorescences) Image source: Jonathan Wilkins Guide


USA National Phenology Network: Taking the Pulse of Our Planet

University of Maine Cooperative Extension

Maine Sea Grant

Contact Information

Signs of the Seasons: A New England Phenology Program
377 Manktown Road
Waldoboro, Maine 04572
Phone: 207.832.0343 or 1.800.244.2104 (in Maine)E-mail:
The University of Maine
Orono, Maine 04469
A Member of the University of Maine System