During the winter months (usually from October to March), it is possible to visit ice caves, but it all depends on the weather.
Whereas in some countries you can visit the same ice caves each year, the conditions in Iceland change each winter and guides must go looking for new caves each season.
Ice caves should never be entered without a professional guide and proper safety gear.
Click here to see which tour operators offer guided ice cave tours.
In addition to natural ice caves, tourists can also visit man-made ice tunnels, which are accessible all year around.