Year-round means happening throughout the entire year, without stopping for any season. A year-round school stays open during the summer instead of taking the traditional long break. Some swimming pools are year-round facilities that stay open even in winter, often by moving indoors or heating the water.

The phrase emphasizes continuity and consistency. A year-round athlete trains every month, not just during their sport's season. A year-round resort welcomes visitors in January as readily as in July. When a grocery store advertises year-round availability of strawberries, they mean you can buy them in December just as easily as in June (though they might come from farther away or cost more in winter).

The opposite would be seasonal: something that only happens during certain months. Ice cream trucks are usually seasonal visitors to neighborhoods, but an ice cream shop might be open year-round. Many jobs are seasonal (like lifeguarding at an outdoor pool), while others continue year-round (like teaching). Understanding whether something operates year-round or seasonally helps you plan and know what to expect.