Answer:
The indicator of spring (in northern climates) that Dickinson includes is the robin
Step-by-step explanation:
The Robin is a king a bird that is used to represent several things because of its varied symbolism, this poem by Dickinson is using it in the representation of the rebirth of something and that rebirth talking about season would be the beginning of spring since it is the first season after the cold winter that might symbolize the end of something.