Hunt unit · Grass Lake National Wildlife Refuge

Open Unit Hunt Unit Map & Access

Open

The Open Unit is one of 2 mapped hunt units on Grass Lake National Wildlife Refuge in Stillwater County, MT. It covers approximately 1,712 acres and is listed as “open to hunting” for 2026–2027. Hunting generally follows state seasons and bag limits, along with general refuge rules.

Navigate to unit Refuge overview
1,712acres
Openstatus 2026–27
Norefuge permit
Stillwater Countycounty

Open Unit map

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OpenSpecial regulationsClosedFWS-owned landWPA (public)Refuge boundaryEasement (private) Tip: switch to Satellite or USGS Topo in the layer menu · click the map for GPS coordinates
Downloads (whole refuge):KMLGPX

Rules & permits for this unit

Status: Open to hunting

Hunting follows Montana seasons, bag limits and licensing, plus general National Wildlife Refuge rules.

Game at Grass Lake NWR

Species listed for the refuge as a whole — a special-regulation unit may be limited to certain species. Confirm in the hunt brochure.

Getting to the Open Unit

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Destination: center of the Open Unit

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Decimal
45.95694, -109.11605
DMS
45°57′25.0″N 109°06′57.8″W

Nearest towns

  • Billings, MT32 mi NW of town
  • Lewistown, MT78 mi S of town
  • Bozeman, MT95 mi E of town

Straight-line distances. Driving routes are longer; many refuge roads are gravel and may close seasonally.

The navigation point is a point inside the unit polygon, not necessarily a parking area or legal access point. Use satellite view to find roads, gates and designated parking, and respect closed areas and private inholdings.

Shooting hours at this unit

Today at Open Unit

Legal light*–
Sunrise–
Sunset–

*½ hour before sunrise — the standard federal shooting-hour start for migratory game birds. Times in Denver local time.

Full season calculator →

2026–2027 season sun table

DateShooting lightSunriseSunsetDaylight
Tue, Sep 1, 20266:06 AM6:36 AM7:57 PM13h 22m
Tue, Sep 15, 20266:23 AM6:53 AM7:30 PM12h 37m
Thu, Oct 1, 20266:43 AM7:13 AM6:58 PM11h 46m
Thu, Oct 15, 20267:01 AM7:31 AM6:32 PM11h 01m
Sun, Nov 1, 20266:25 AM6:55 AM5:04 PM10h 09m
Sun, Nov 15, 20266:45 AM7:15 AM4:46 PM9h 31m
Tue, Dec 1, 20267:07 AM7:37 AM4:34 PM8h 57m
Tue, Dec 15, 20267:21 AM7:51 AM4:31 PM8h 41m
Fri, Jan 1, 20277:28 AM7:58 AM4:40 PM8h 43m
Fri, Jan 15, 20277:24 AM7:54 AM4:55 PM9h 01m
Mon, Feb 1, 20277:09 AM7:39 AM5:19 PM9h 40m

Computed for 45.957, -109.116 (MDT / DST-aware). Check state rules — big game hours vary.

Weather forecast

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Forecast from the National Weather Service. Wind direction matters — plan your approach downwind of where game beds.

Other units at Grass Lake NWR

UnitStatusAcresPermit
Closed UnitClosed1,682—

Back to Grass Lake NWR →