When are cherries havested

I just need to know when cherries ripen

Berries, citrus, cherries, dates, and grapes are all considered non-climacteric fruits. This means that once they are picked, they will not ripen any further, because the parent tree provides the ripening agents and sugars that sweeten them. When selecting these types of fruits in the market, look for plump, juicy, well scented specimens, because what you see is what you will get. Store these fruits with care, and plan on eating them within a few days.

Source: http://www.wisegeek.com/how-can-i-tell-when-fruit-is-ripe.htm