What size and limit rules apply to crabbing in San Francisco Bay in 2027?

Direct Answer

For the 2027 recreational crabbing season in San Francisco Bay, the California Department of Fish and Wildlife (CDFW) enforces a minimum size limit of 5¾ inches (measured across the carapace) for Dungeness crab, with a daily bag limit of 10 crabs per person. Rock crab (red, yellow, and brown species) have a minimum size of 4 inches and a combined daily bag limit of 35 crabs. The season typically runs from November 6, 2026, through July 30, 2027, though specific closures or restrictions may be triggered by whale entanglement risk assessments or domoic acid levels using real-time data from the CDFW's Crab Fishing Information System.

Season Structure and Timing

The 2027 San Francisco Bay crabbing season operates within the broader Central Management Zone (Bodega Bay to Monterey Bay), with exact dates determined by the CDFW Director based on annual pre-season tests (typically conducted in October). For 2027, the recreational Dungeness season is expected to open on November 6, 2026 (the Saturday before Thanksgiving) and close on July 30, 2027, unless an early closure is triggered by marine life entanglement risks. The 2027 rock crab season runs year-round, but no take is allowed from March 1 through June 30 in certain areas to protect molting crabs.

Key dates for 2027:

• Dungeness crab: November 6, 2026 – July 30, 2027
• Rock crab (recreational): Year-round, with closed season March 1–June 30 in specific management zones
• Commercial Dungeness: November 15, 2026 – June 30, 2027 (reduced from historical July 15 closure)

Size and Limit Rules by Species

Dungeness Crab (Metacarcinus magister)

• Minimum size: 5¾ inches (measured straight across the carapace, not including spines)
• Daily bag limit: 10 crabs per person
• Possession limit: 20 crabs (two days' bag limit) when on a multi-day trip
• Measurement method: Carapace width must be measured between the two outermost points (excluding the spines)

Rock Crab (Cancer productus, Cancer antennarius, Cancer gracilis)

• Minimum size: 4 inches (measured across the carapace)
• Daily bag limit: 35 crabs (combined total of all rock crab species)
• Possession limit: 70 crabs (two days' bag limit) for multi-day trips
• No size limit for slender crab (Cancer gracilis) in some areas, but still counts toward the 35-crab limit

Other Crab Species

• Red rock crab (Cancer productus): Same 4-inch minimum, included in the 35-crab limit
• Yellow crab (Cancer antennarius): Same 4-inch minimum, included in the 35-crab limit
• Coonstripe shrimp (Pandalus danae): No size limit, but must be counted in the 35-crab bag limit if taken with crab gear

Gear Restrictions and Compliance

Permitted Gear Types

• Circular traps (max 3 per person) with escape rings (minimum 4¼ inches diameter) and biodegradable escape panels (must be made of untreated cotton or manila rope)
• Ring nets (max 5 per person) with no more than 3 rings per net
• Hoop nets (max 5 per person) with no more than 3 hoops per net
• Snare loops (max 5 per person) with no more than 3 loops per snare

Prohibited Gear

• No trawl nets or gill nets for recreational crabbing
• No spears or harpoons
• No poison or explosives
• No unattended traps (must be attended at all times if using traps)

Trap Marking Requirements

• Buoys must be bright orange or red with white reflective tape (minimum 4 inches wide)
• Trap tags must be attached with your CDFW license number visible
• No submerged buoys allowed (must float on the surface)

Size Measurement Methods

Dungeness Crab Measurement

Use a crab gauge (available at most tackle shops for $5–$15) to measure straight across the carapace between the two outermost points (excluding spines). The 5¾-inch minimum applies to the hard-shell width; soft-shell crabs (recently molted) are not legal even if they measure 5¾ inches.

Rock Crab Measurement

Measure across the carapace at the widest point, excluding spines. For red rock crabs, the 4-inch minimum applies to hard-shell specimens only.

Seasonal Closures and Special Regulations

Whale Entanglement Risk

The CDFW uses real-time data from NOAA Fisheries to assess whale entanglement risk in 2027. If humpback whale aggregations exceed 10 whales per square mile in a management zone, the CDFW Director may close the Dungeness crab season early (typically in April–May). For 2027, the Central Management Zone (including San Francisco Bay) has a mandatory closure from May 1 to July 15 for commercial Dungeness crab, but recreational closures are triggered by risk assessments rather than fixed dates.

Domoic Acid Closures

The CDFW tests crab viscera for domoic acid levels weekly during the season. If levels exceed 30 ppm (parts per million), the CDFW Director may close the fishery for that species. In 2027, Dungeness crab is the primary species tested; rock crab is tested monthly due to lower risk.

Area-Specific Closures

• San Francisco Bay (within the Golden Gate Bridge): No take of Dungeness crab from April 1 to June 30 in Zone 3 (south of the Bay Bridge)
• Tomales Bay (Marin County): No take of Dungeness crab from March 1 to June 30
• Bodega Bay (Sonoma County): No take of Dungeness crab from April 1 to June 30

Enforcement and Penalties

Fines and Penalties

• First offense: $100–$500 fine plus $50 per illegal crab
• Second offense: $500–$1,000 fine plus $100 per illegal crab
• Third offense: $1,000–$5,000 fine plus $200 per illegal crab, plus possible jail time (up to 6 months)
• Possession of undersized crabs is a strict liability offense (no "I didn't know" defense)

Reporting Requirements

• CDFW requires recreational crabbers to report their catch within 30 days of the season end via the CDFW Online Reporting System
• Commercial crabbers must report daily via the CDFW Electronic Logbook System

Real-Time Data and Technology

CDFW Crab Fishing Information System

The CDFW's Crab Fishing Information System (launched in 2023) provides real-time updates on:

• Season status (open/closed for each species and zone)
• Domoic acid test results (updated weekly)
• Whale entanglement risk (updated daily during peak season)
• Size limit reminders (pop-up alerts when you enter a closed zone)

Third-Party Apps

• iNaturalist (free app) allows you to report crab sightings and check size limits using AI-powered photo ID
• CDFW Wildlife app (free) provides offline access to size limit charts and season calendars
• NOAA Fisheries app (free) provides real-time whale sightings and entanglement risk maps

Decision Tree for 2027 San Francisco Bay Crabbing

Process Loop for 2027 Crabbing Season

FAQ

What is the minimum size for Dungeness crab in San Francisco Bay in 2027? The minimum size is 5¾ inches measured straight across the carapace, excluding spines. This applies to hard-shell crabs only; soft-shell crabs are not legal regardless of size.

Can I crab in San Francisco Bay year-round in 2027? No. The Dungeness crab season runs from November 6, 2026, to July 30, 2027, but may close earlier due to whale entanglement risk or domoic acid levels. Rock crab can be taken year-round, but no take is allowed from March 1 to June 30 in Zone 3 (south of the Bay Bridge).

How many crabs can I keep per day in 2027? You can keep 10 Dungeness crabs per day (20 on multi-day trips) and 35 rock crabs per day (70 on multi-day trips). These limits apply per person, not per boat.

What gear is legal for crabbing in San Francisco Bay in 2027? Legal gear includes circular traps (max 3 per person) with escape rings and biodegradable escape panels, ring nets (max 5 per person), hoop nets (max 5 per person), and snare loops (max 5 per person). Trawl nets, gill nets, spears, harpoons, poison, and explosives are prohibited.

How do I measure a crab correctly? Use a crab gauge to measure straight across the carapace at the widest point, excluding spines. For Dungeness crab, measure between the two outermost points of the carapace. For rock crab, measure at the widest point of the carapace. Soft-shell crabs are not legal even if they meet the size minimum.

What happens if I catch an undersized crab? You must release it immediately using wet hands to avoid injury to the crab. Possession of undersized crabs is a strict liability offense, with fines starting at $100 per crab for a first offense and up to $5,000 for a third offense.

Do I need a license to crab in San Francisco Bay in 2027? Yes. All recreational crabbers 16 years and older must have a valid California fishing license with ocean enhancement validation. Licenses can be purchased online via the CDFW Online License System for $54 (annual resident) or $15.50 (one-day non-resident).

How do I report my catch in 2027? You must report your catch within 30 days of the season end via the CDFW Online Reporting System. The system asks for species, number kept, number released, and location. Failure to report can result in license suspension for the following season.

Bottom Line

For 2027, San Francisco Bay crabbing is tightly regulated with 5¾-inch minimum size for Dungeness (10 per day) and 4-inch minimum for rock crab (35 per day), with season dates subject to real-time adjustments based on whale entanglement risk and domoic acid levels. Use the CDFW Crab Fishing Information System and iNaturalist app for real-time updates, and always carry a crab gauge to avoid fines. Plan your trips around the November 6, 2026–July 30, 2027 Dungeness window and the year-round rock crab season with its March–June closures in certain zones.

Sources

• CDFW – 2027 Recreational Crab Season Information
• CDFW – Dungeness Crab Size and Bag Limits
• CDFW – Rock Crab Regulations
• NOAA Fisheries – Whale Entanglement Risk Assessments
• CDFW – Domoic Acid Testing Results
• iNaturalist – Crab Identification and Reporting
• CDFW – Online License System
• California Code of Regulations – Title 14, Section 29.80 (Crab Regulations)

*This guide covers 2027 size and limit rules for crabbing in San Francisco Bay, including Dungeness and rock crab regulations, gear restrictions, and real-time closure triggers.*