This state's classification carries no date range for the species.
"Prairie chicken" appears in Montana's statutory definition of upland game birds (MCA 87-2-101) but the 2026 FWP Upland Game Bird Regulations booklet's season-dates tables contain no bag limit, dates, or license line for prairie chicken at all — no huntable season is currently offered.
Lower-confidence closure, flagged explicitly (mirrors the CA white-tailed ptarmigan and IL/IN/MI ruffed grouse judgment calls from prior Tier B batches): greater prairie-chicken is closed in Montana (unlike the huntable sharp-tailed grouse). The statewide Upland Game Bird Season Outlook covers sharp-tailed grouse in detail, but neither the Tier A pass nor a fresh targeted search this pass (“Montana greater prairie-chicken survey monitoring FWP lek”) turned up any dedicated Montana-specific prairie-chicken monitoring program distinct from that sharp-tailed grouse coverage. Not a documented confirmed-absence statement from Montana FWP itself — worth a second look with different search terms or a direct FWP inquiry.