Now the time... — The first grapes ripen in Palestine as early as August, or even July, although the vintage does not take place until September or October.
Related Commentaries of Numbers 13:20
Numbers 13:20
20 And what the land is, whether it be fat or lean, whether there be wood therein, or not. And be ye of good courage, and bring of the fruit of the land. Now the time was the time of the firstripe grapes.