Unlike beaches elsewhere that are made up mostly of pulverized coral, Siesta Beach's sand is 99% quartz, most of which comes from the Appalachian Mountains. Over time the feldspar and mica have been removed from the rock, leaving almost pure quartz. Even on the hottest days, the sand is so reflective that it feels cool underfoot. According to Harvard University geologists, it's estimated that the sand on Siesta Beach and Crescent Beach on Siesta Key is millions of years old, having its origin in the Appalachians and flowing down the rivers from the mountains until it eventually was deposited on the shores of Siesta Key.
The southern portion of Siesta Beach is alternatively called Crescent Beach, which extends to the sea wall and Point of Rocks, an area with coral and active marine life.
Siesta Beach is not only long, but also expansively wide, especially around the Siesta Key Beach Pavilion section. The beach is so wide the city installed walking mats to help beachgoers get to the shore, where they can then walk on firmer wet sand.
Up until the 20th century, Siesta Key was virtually vacant and was referred to as Clam Island, Little Sarasota Island, or Sarasota Key. The Island was not connected to the city of Sarasota in any way, so the only way to get to and from the island was by boat. It had deep vegetation, snakes of all varieties (including all of the venomous ones found in the United States - rattlesnakes, copperheads, water moccasins and coral snakes), sand fleas, wildcats and wild boars.
It remained that way until 1906 when Mr. and Mrs. Roberts opened the Roberts’ (or Siesta) Inn. This hotel became very popular for people who wanted a place to escape the cold winters of the north. The Roberts’ Inn also attracted many people because of Mrs. Roberts’ cooking (specifically her seafood dishes). Mr. Roberts teamed up with Mayor Harry Higel to create the Siesta Land Company, which formed Siesta Village and renamed the island Siesta Key around a year after he opened his hotel. In 1914, Higel opened his own hotel called Higelhurst and used his boat to transfer guests to and from the city. Higel also worked to get the Army Corps Engineers to build a bridge that would connect the key with the city of Sarasota. He was finally able to, and that bridge opened in 1917, which connected the northern part of the key with the city. In 1927, a second bridge opened at the southern end of the key on Stickney Point.
In 1954, Sarasota County first purchased property on the key for a public beach. Slowly, Siesta Key began to grow in population, and now around 350,000 tourists visit it every year.
In 2018 the beaches were impacted by Karenia brevis, an algae drift known as red tide. Several tons of dead fish washed ashore on the beach at various times, most of which were removed in the early morning hours by the truckload. The toxins from red tide cause respiratory discomfort to humans, in addition to killing fish, turtles, and manatees. In the past, the cycle of red tide has lasted up to eighteen months.
- "Siesta Key Beach - The History Behind America's #1 Beach - Doug Parks". June 11, 2012. Retrieved September 30, 2015.
- Doup, Liz (July 5, 2009). "The best beach in Florida is on Siesta Key". South Florida SunSentinel. Retrieved December 18, 2018.
Thanks to Harvard's geology department, which studies such things, you learn that the clean, flour-like sand is 99 percent pure quartz grains. Those grains are very fine, without coral or shell fragments.
- "Siesta Key Beach gets accessible roll-out mat to the water (WWSB ABC 7)". Retrieved April 2, 2017.
- Key, Florida Vacations - Destination Siesta. "Siesta Key History - Florida Vacations". flvacationguides.com. Retrieved September 30, 2015.
- Adams, Rick (August 1, 2018). "Thousands of dead fish on Siesta Beach, red tide could be to blame". Archived from the original on August 7, 2018. Retrieved August 7, 2018.
- Putterman, Samantha (August 2, 2018). "Hundreds of dead fish line Siesta Key beach. Red tide may be heading to Manatee next". Retrieved December 18, 2018.
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