I have amalgamated :

"Autumn First"
For the first sightings in Autumn for your area - any plant (seedling, growth, flower, fruit), bird (seen, calling, mating, nesting, young, flocking), animal or fungus (fruiting or growing).

&

"Spring First"
For the first sightings in Spring for your area - any plant (seedling, growth, flower, fruit), bird (seen, calling, mating, nesting, young, flocking), animal or fungus (fruiting or growing).

This project allows both these firsts, and also the "lasts" of the seasons.
The different options are now recorded in a field.