The spring discharges an average of 102 million gallons of water daily.
During peak winter months, the spring can host over 700 manatees at one time.
The park's water quality is crystal clear due to the subterranean limestone filtration system.
The Thursby House was built using a mix of traditional wood construction and tabby, a form of early concrete made with oyster shells.
The spring run is home to the rare and endemic Blue Spring hydrobe, a type of freshwater snail.
Blue Spring State Park is a designated manatee refuge and the largest spring on the St. Johns River. The spring run maintains a constant water temperature of 73 degrees Fahrenheit year-round. It serves as a critical overwintering site for West Indian manatees, which congregate in the spring when river temperatures drop. The park preserves the historic Thursby House, an 1872 structure reflecting early Florida pioneer life. Visitors access the water via a boardwalk that runs alongside the spring to minimize ecological disruption to the ecosystem. Swimming, snorkeling, and scuba diving are permitted in the spring run outside of manatee protection seasons. Kayak and canoe rentals are available to navigate the St. Johns River and the spring run. The park features a dense hardwood hammock forest typical of the St. Johns River valley. It is an active archaeological site with evidence of indigenous habitation dating back several millennia.
The elevated observation deck overlooking the headspring provides a clear view of the water and manatee activity.
Check the official park website for daily capacity updates, as the park frequently closes when parking lots reach full occupancy.
Bring polarized sunglasses to significantly improve visibility of manatees and fish through the water surface.
Arrive early in the morning to beat the influx of daily visitors and ensure entry.
Attempting to visit on weekends or holidays without arriving at dawn, as the park reaches capacity rapidly and suspends entry.
Water activities including swimming, snorkeling, and diving are prohibited during manatee season, typically mid-November through March.
Manatee protection laws are strictly enforced; do not touch, feed, or harass wildlife. Use reef-safe sunscreen to protect the spring water quality.
