Natural swimming hole
Big Lagoon
Lake · California
Community-reported spot. Details below are compiled from public sources and are reported to be accurate — always verify locally before visiting.
About this swimming hole
Big Lagoon is the largest of Humboldt's coastal lagoons, with a county park swim beach on its calm, brackish water. On warm inland days the lagoon can be ten degrees warmer than the ocean beaches nearby. It is a favorite for families who want water time without the surf.
Good to know
| Water type | Lake |
|---|---|
| Water temperature | 60s-70s in summer |
| Depth | large lagoon with swim beach |
| Best season | June-September |
| Fees | $5 day use |
| Reservations required | No |
| Parking | county park lot |
| Amenities | restrooms, picnic tables, boat launch |
| County | Humboldt County |
| Nearest town | Trinidad |
| Safety notes | no lifeguard; boat traffic; check water quality advisories |
Map
Nearby swimming holes
Frequently asked questions
Can you swim in Big Lagoon?
Yes — Big Lagoon is listed as a natural swimming spot in California. Reported water temperature: 60s-70s in summer. Heads-up: no lifeguard; boat traffic; check water quality advisories. There are rarely lifeguards at natural swimming holes — verify conditions locally before you go.
Does Big Lagoon require reservations?
No reservations are required at Big Lagoon based on current information — but verify before you go.
Is there a fee to visit Big Lagoon?
Reported fee info: $5 day use. Fees can change — confirm with the official link.
When is the best time to visit Big Lagoon?
The best season is typically June-September.