Ask when manatee season is and you’ll hear three different answers: November to March, November to April, or “all year.” All three are partly right, because “manatee season” means different things depending on who’s talking: a wildlife refuge’s sanctuary dates, a visitor bureau’s peak viewing window, or a tour captain’s sense of when the springs fill up.
This guide sorts that out for Florida’s Nature Coast, where Crystal River and the Homosassa River draw some of the largest winter manatee gatherings in the state, with a month-by-month look at what to expect.
TL;DR
- Florida manatees need water warmer than about 68 degrees. When the Gulf cools below that, they move into warm springs, and that movement drives every “manatee season.”
- On the Nature Coast, manatees start gathering at the springs around October, and numbers are typically highest from December through February.
- Crystal River National Wildlife Refuge’s manatee season, when its seven warm-water sanctuaries are in effect, runs November 15 to March 31.
- Cold snaps matter more than the calendar: the best days often follow several cold nights in a row.
- Manatees don’t vanish in summer. Resident manatees stay year-round, just spread out along the rivers.
Why manatees follow the temperature
Manatees can’t tolerate cold water for long. The Florida Fish and Wildlife Conservation Commission (FWC) says manatees rely on water warmer than 68 degrees Fahrenheit, and the U.S. Fish and Wildlife Service (USFWS) describes winter as the time “when manatees need warm water (> 68 degrees Fahrenheit) for survival.”
That’s where the springs come in. The Southwest Florida Water Management District says the springs in Crystal River’s Kings Bay “remain at a constant 72 degrees year-round” and provide thermal refuge when the Gulf drops below 68 degrees. Swim With Manatees’ captains find the Homosassa River’s springs stay about 72 degrees all year as well. So as the Gulf cools each fall, manatees move inland to the spring-fed rivers, sometimes within a single night.
What “manatee season” actually means
Here’s how the most common definitions line up.
| Who says it | Dates | What it means |
|---|---|---|
| Crystal River National Wildlife Refuge (USFWS) | Nov 15 to Mar 31 | When the refuge’s seven warm-water manatee sanctuaries are in effect and closed to all activity |
| Discover Crystal River (Citrus County visitor bureau) | November through April, highest December to February | Peak manatee viewing season |
| Swim With Manatees (Homosassa River tour operator) | Mid-October to late April | The big migration, on top of resident manatees year-round |
None of them is wrong. The refuge dates are a regulatory window, the visitor bureau describes when viewing is best, and tour captains describe when the migratory manatees are in. The practical takeaway: plan for the cold months if you want the biggest numbers, and plan for cold days within those months if you can.
Manatee season month by month
These notes describe Crystal River and the Homosassa River in a typical year. Weather shifts everything, so a warm January or an early cold front can move the pattern by weeks.
October
The first cool fronts arrive, and the Friends of the Crystal River National Wildlife Refuge Complex notes that “in October, as temperatures drop, manatees start to congregate in the headwaters of the Crystal and Homosassa River.” Numbers are still building, crowds are light, and the weather is often comfortable for being on the water.
November
Manatees keep arriving as the Gulf cools. On November 15, Crystal River National Wildlife Refuge’s seven warm-water manatee sanctuaries take effect. They’re marked areas, closed to people and boats so manatees have quiet places to rest.
December
The peak begins. Discover Crystal River says the local manatee population is at its highest between December and February.
January
January is often the heart of the season. On January 31, 2022, a refuge aerial survey counted 1,016 manatees in Kings Bay and 304 on the upper Homosassa River, part of a record 1,333 manatees counted in Citrus County that year (Source: Discover Crystal River, reporting Crystal River National Wildlife Refuge survey results). Cold snaps can also trigger temporary closures at Three Sisters Springs so manatees can rest undisturbed.
February
Still peak season, and sometimes the coldest stretch. February 2026 was hard on Florida manatees: FWC’s preliminary mortality report lists 39 cold-stress deaths statewide from January 1 through October 2, 2026, most of them in February, against a five-year average of 15 for the same period. Cold Februaries pack the springs, which is good for viewing and a reminder of why the warm-water sanctuaries matter.
March
Swim With Manatees’ captains typically see good numbers early in the month, thinning as the Gulf warms. The refuge’s sanctuaries come down after March 31.
April
FWC notes that “as temperatures rise in spring, manatees gradually disperse from their winter habitats.” Migratory manatees head back out along the coast through April, and the springs quiet down.
May through September
Summer is the quiet season. Many manatees spread out along Florida’s coast and rivers, and FWC notes that some travel as far as Georgia and the Carolinas, with a few reaching Massachusetts. But not all leave: Swim With Manatees’ captains find resident manatees on the Homosassa River all summer, including mothers with calves, rehabilitated animals and a few that simply never leave. Save the Manatee Club notes a broad spring-to-summer calving peak, so summer is a good time to see young calves.
Cold days beat the calendar
Within the season, the specific day matters more than the month. Swim With Manatees’ captains see the biggest gatherings after several cold nights in a row: when it’s cold, the 10 to 15 manatees in a spring can become 75 to 150. A big storm front can make the day before it tricky, as manatees feed heavily ahead of the weather and then settle in.
In 2016 the USFWS advised that the best time to see manatees in the springs is during high tide on cold days. If you have flexibility, watch the forecast for a cold night or two and book the morning after.
What changes besides manatee numbers
| Cooler months (mid-October to late April) | Warmer months (May to September) | |
|---|---|---|
| Manatees | Migratory manatees join the residents; the year’s biggest numbers | Resident manatees, more spread out |
| Where they are | Close to the warm springs | Along the river and feeding areas |
| Water | Springs about 72 degrees; crowded springs can get stirred up | River often 80 degrees or warmer, often tea-colored from natural tannins |
| Crowds | Busiest season in the area | Quieter, fewer boats on the water |
| Refuge sanctuaries | In effect November 15 to March 31 | None in place |
Clear water is never guaranteed in any season. The Homosassa and Crystal rivers are natural spring-fed rivers, and visibility changes with tides, rain, wind and how many manatees are moving around.
Is summer worth it?
It can be, if you go in knowing what it is. You’ll usually see fewer manatees, in darker water, often with your boat to yourselves. Swim With Manatees, a small-group manatee snorkel tour company on the Homosassa River in Citrus County, runs tours all year and finds manatees on 90% of trips. One of its guests summed up an August trip this way: four or five manatees in tea-colored water, and amazing anyway.
FAQ
When is manatee season in Florida?
Florida’s manatee season is the cold half of the year, roughly November through March or April, when manatees gather at warm springs and other warm-water sites. Crystal River National Wildlife Refuge’s official manatee season, when its sanctuaries are in effect, runs November 15 to March 31.
What is the best month to see manatees in Crystal River?
Numbers are typically highest from December through February, according to Discover Crystal River. January is often the peak, and the best individual days tend to follow a run of cold nights.
Can you see manatees in Crystal River and Homosassa in summer?
Yes. Many manatees disperse in summer, but resident manatees stay on the rivers year-round. You’ll see fewer, and they’ll be spread out rather than gathered at the springs.
What water temperature do manatees need?
FWC and USFWS put the threshold at about 68 degrees Fahrenheit. Below that, manatees risk cold stress, which is why they move to springs that stay about 72 degrees all year.
Does Three Sisters Springs close during manatee season?
Three Sisters Springs can close temporarily to in-water visitors during extreme cold, when large numbers of manatees are resting there. Closures are announced by the refuge as conditions require. See our Three Sisters Springs guide for current details.
The bottom line
Manatee season on Florida’s Nature Coast follows the cold: manatees start gathering in October, peak from December through February, and disperse in April. For the biggest numbers, go in winter and aim for the morning after a cold night. For a quieter trip with fewer boats, the warm months still offer resident manatees on the Homosassa River. For what the day itself looks like, see What to Expect on your manatee tour.
