Quick answer: 16 native Utah plants have a recorded bloom range that includes September.
16 species
- Apache plume Fallugia paradoxa · 6 states
- Big bluestem Andropogon gerardii · 25 states
- Blue grama Bouteloua gracilis · 15 states
- Butterflyweed Asclepias tuberosa · 37 states
- Common sneezeweed Helenium autumnale · 13 states
- Creosote bush Larrea tridentata · 5 states
- Cutleaf coneflower Rudbeckia laciniata · 21 states
- Fireweed Chamerion angustifolium · 28 states
- Little bluestem Schizachyrium scoparium · 23 states
- Rocky Mountain bee plant Peritoma serrulata · 22 states
- Scarlet gilia Ipomopsis aggregata · 9 states
- Scarlet globemallow Sphaeralcea coccinea · 5 states
- Shrubby cinquefoil Dasiphora fruticosa ssp. floribunda · 15 states
- Sideoats grama Bouteloua curtipendula · 25 states
- Swamp milkweed Asclepias incarnata · 25 states
- Wyoming Indian paintbrush Castilleja linariifolia · 4 states