The indexbloomin season or not

Coreopsis & phlox roadside bloom

Fires when in season

Photograph Tom Lazar · CC0

March through May. The notch is October.

No date. in season or not — this one is decided by the weather, not by the calendar, so the honest answer is a month rather than a day.

From the field

Roadside means roadside — the frame is taken from a verge with traffic behind you, and the light is gone by nine.