Quick answer: 6 native Idaho plants have a recorded bloom range that includes October.
6 species
- Black-eyed Susan Rudbeckia hirta · 42 states
- Cutleaf coneflower Rudbeckia laciniata · 21 states
- Pearly everlasting Anaphalis margaritacea · 18 states
- Scarlet gilia Ipomopsis aggregata · 9 states
- Shrubby cinquefoil Dasiphora fruticosa ssp. floribunda · 15 states
- Swamp milkweed Asclepias incarnata · 25 states