Chervil is a spring herb. It will show up in winter in warmers climates and at the end of winter in temperate climates or from growers using greenhouses. Otherwise, fresh chervil is usually only available in spring and into early summer in cooler areas. Like parsley and cilantro, heat will cause chervil to bolt, go to seed, and turn bitter.

Chervil isn't as Common as parsley or cilantro, however, so you'll probably need to hunt it down at specialty stores or farmers markets. If you can't find chervil at markets near you, consider growing it yourself. It is happy in gardens without too much sun or shade, a nice mix is the way to go, and can also grow nicely in a small pot on a windowsill in a classic in-kitchen herb garden.