Honduras · Bay Islands
Utila
Popular shoulder-to-dry-season period with whale shark potential.
Utila is one of the world's cheapest places to learn to dive — small Caribbean island in the Bay Islands chain, dozens of dive shops, and a reliable whale shark population on the north side. Reef diving is fine; the price and atmosphere are the draw.
Good season
March–September is best for whale sharks and viz. October–February brings northers (cold fronts).
Trip duration
5–10 nights for cert; longer for whale sharks.
Dive style
Boat diving on shallow reefs; mild current.
Dive level
Beginner-friendly.
Reef health
What you’ll actually findThis reef is losing coral faster than it's recovering. If it's on your list, go sooner — and manage expectations on coral colour.
Coral reef health
How is this calculated?On current trend, no live coral by ~2044. Losing about 1.1% cover per year — roughly 20 years of reef left to see if nothing changes.
Heat stress right now
No abnormal heat right now. Corals stay coloured.
NOAA Coral Reef Watch · updated May 2026 · 0 °C-week heat dose
What to expect on a dive
Bay Islands reefs along the Mesoamerican Reef have thinned. Whale shark sightings are the marquee draw.
Sources, methodology, and the raw numbers
Raw observed numbers
- Coral cover: 22% (survey Sep 2024, AGRRA reef survey protocol)
- Bleached: 20%
- Recent mortality: 8%
- Caribbean post-2023 — observed condition reflects the declining regional pattern.
Raw thermal numbers
- NOAA CRW alert level: No stress
- Degree Heating Weeks: 0 °C-wk
- SST anomaly: +0.6 °C
How we summarise this
Observed coral cover, bleaching, and mortality come from named in-situ surveys with a stated date and method — they describe one snapshot of one reef and do not extrapolate to neighbouring sites. Current thermal stress is satellite-derived from NOAA Coral Reef Watch at ~5 km resolution; it indicates risk, not observed coral damage. We deliberately separate observed condition, current thermal stress, and projection — and we never publish a projection without a documented model and uncertainty.
Sources
- Atlantic and Gulf Rapid Reef Assessment — AGRRA Program / Perry Institute for Marine Science
- NOAA Coral Reef Watch — U.S. National Oceanic and Atmospheric Administration
- AIMS Long-Term Monitoring Program — Australian Institute of Marine Science
- Global Coral Reef Monitoring Network — GCRMN / ICRI
- NOAA National Coral Reef Monitoring Program — NOAA Coral Reef Conservation Program
- Reef Check — Reef Check Foundation
- NOAA CoastWatch / OceanWatch — NOAA NESDIS / STAR
- Allen Coral Atlas — Arizona State University Center for Global Discovery and Conservation Science
- Great Barrier Reef Marine Park Authority — Australian Government
- International Coral Reef Initiative — ICRI Secretariat
- Reef Life Survey — Reef Life Survey Foundation
- NASA PO.DAAC — NASA Jet Propulsion Laboratory / Caltech
- Copernicus Marine Service — Mercator Ocean International for the European Union
- NASA Ocean Color (OB.DAAC) — NASA Goddard Space Flight Center / Ocean Biology Processing Group
- Argo float network — International Argo Program / UCSD
- CoralWatch — University of Queensland
- IMOS / AODN — Integrated Marine Observing System / Australian Ocean Data Network
- WRI Reefs at Risk Revisited — World Resources Institute
- Ocean Health Index — OHI partnership (Conservation International + UCSB + NCEAS)
- IPCC Special Report on the Ocean and Cryosphere (SROCC) — Intergovernmental Panel on Climate Change
- GOA-ON — Global Ocean Acidification Observing Network — GOA-ON Secretariat + IOC-UNESCO
- HAEDAT — Harmful Algae Event Database — IOC-UNESCO Intergovernmental Panel on Harmful Algal Blooms
- NCEI Marine Microplastics — NOAA National Centers for Environmental Information
Reef condition changes year to year. If you visit, consider supporting responsible-travel and conservation operators on the ground.
Pressure on this reef
Protection · fishing · what you can doProtected-area status
Multi-use MPAInside a designated MPA that permits regulated fishing and other uses. Worth checking which zones at this location are no-take.
Fishing pressure
High fishing pressureDominant pressures
- overfishing
- SCTLD disease
- warming
- cruise-ship anchoring
2 Green Fins-verified operators known at this location.
What you can do
Bay Islands National Marine Park has paper protection; enforcement is patchy. Lower-protection Caribbean. The biggest pressures are SCTLD disease and overfishing — support operators that participate in coral-restoration nurseries.
Protection status sourced from Protected Planet / WDPA and refined with Marine Protection Atlas. Fishing pressure proxy is Global Fishing Watch AIS data. See the methodology for what these sources can and can’t prove.
Pollution & water-quality
What divers should knowSCTLD coral disease outbreak
CONCERNINGSince 2020
Same Bay Islands SCTLD progression as Roatan. Hard-coral loss is visible at most reef sites.
Plastic pollution from Río Motagua
CONCERNINGSince ongoing
Caribbean current brings significant plastic debris through the Bay Islands.
What this means for your trip
Whale shark season (Mar–Apr) is unaffected — they're plankton feeders cruising the channel. For reef diving, choose deeper sites where impact is lower.
Dive sites here
2 curated
CJ's Drop-off
Sheer wall a short boat ride from East Harbour where the reef shelf falls into deep water within fin-kicking distance of the mooring. Whale …
Halliburton Wreck
30 m steel cargo vessel deliberately sunk in 1998, sitting upright in 30 m of water with the wheelhouse at 18 m. Heavy sponge growth, school…
Gear
What to bringSite-specific add-ons
Some dive sites here call for extra gear. Check the individual site page for full context.
- SMB + reel — Whale shark encounters often happen on safety stops in open water. · CJ's Drop-off
- Dive light — Interior swim-throughs need a primary beam. · Halliburton Wreck
- Wreck-trained guide — Penetration sections require formal wreck training. · Halliburton Wreck
What divers say
“Got my Open Water for $300, swam with two whale sharks the next week. Utila is unfair value.”