Hunt unit · Don Edwards San Francisco Bay National Wildlife Refuge

M4 Hunt Unit Map & Access

OpenPermit required

The M4 unit is one of 21 mapped hunt units on Don Edwards San Francisco Bay National Wildlife Refuge in Alameda County, CA. It covers approximately 529 acres and is listed as “open to hunting” for 2026–2027. Hunting generally follows state seasons and bag limits, along with general refuge rules. A refuge permit is required.

Navigate to unit Refuge overview Official hunt info ↗
529acres
Openstatus 2026–27
Yesrefuge permit
Alameda Countycounty

M4 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 California seasons, bag limits and licensing, plus general National Wildlife Refuge rules.

Refuge permit required. Type: Other. Obtain via: Online Other.

A permit is required to hunt the Alviso Ponds; recommended, but not required, for the other portions of the refuge open to hunting.

Game at Don Edwards San Francisco Bay 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 M4 unit

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Destination: center of the M4 unit

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Decimal
37.47505, -121.98140
DMS
37°28′30.2″N 121°58′53.0″W

Nearest towns

  • San Jose, CA11 mi NW of town
  • San Francisco, CA31 mi SE of town
  • Stockton, CA51 mi SW 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 M4

Legal light*–
Sunrise–
Sunset–

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

Full season calculator →

2026–2027 season sun table

DateShooting lightSunriseSunsetDaylight
Tue, Sep 1, 20266:07 AM6:37 AM7:39 PM13h 02m
Tue, Sep 15, 20266:18 AM6:48 AM7:17 PM12h 29m
Thu, Oct 1, 20266:32 AM7:02 AM6:52 PM11h 51m
Thu, Oct 15, 20266:44 AM7:14 AM6:32 PM11h 18m
Sun, Nov 1, 20266:01 AM6:31 AM5:11 PM10h 39m
Sun, Nov 15, 20266:16 AM6:46 AM4:58 PM10h 12m
Tue, Dec 1, 20266:33 AM7:03 AM4:50 PM9h 47m
Tue, Dec 15, 20266:44 AM7:14 AM4:51 PM9h 36m
Fri, Jan 1, 20276:52 AM7:22 AM4:59 PM9h 37m
Fri, Jan 15, 20276:51 AM7:21 AM5:11 PM9h 50m
Mon, Feb 1, 20276:41 AM7:11 AM5:30 PM10h 18m

Computed for 37.475, -121.981 (PDT / 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 Don Edwards San Francisco Bay NWR

UnitStatusAcresPermit
A6Open451Required
A19Open300Required
Bair IslandOpen1,954Required
Greco IslandOpen1,174Required
M1Open496Required
M2Open610Required
M3Open544Required
M5Open413Required
M6Open440Required
R1Open454Required
R2Open133Required
A2ESpecial regs335Required
A3NSpecial regs164Required
A3WSpecial regs575Required
A5Special regs640Required
A7Special regs267Required
A8Special regs597Required
AB1Special regs154Required
AB2Special regs147Required
ClosedClosed17,762Required

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