The roads which pass through the high mountains are only open in the summer season.
Чун ба дарахти анҷир наздик шуд, ғайр аз баргҳо чизе наёфт, зеро мавсими анҷир ҳанӯз нарасида буд.
When he came near to the fig tree, apart from leaves he found nothing, because the fig season had not yet arrived.
See also –
Adding the letter ӣ to the noun (мавсим) changes it to an adjective (мавсимӣ).
мавсими пахтачинӣ: cotton-picking season
мавсими хушк: dry season
мавсими шикор: hunting season