There is no definite answer for this question because there are a lot of factors involved in this answer. The short answer is that April and May are perfect for Iran first timers and those who would like to combine their cycling holiday with cultural and historical tours. Also October and May would be another choice for the above group. For those who have already visited Iran before and would like to only come to Iran for a cycling holiday the answer is that the entire year is the best season. For example, winter is one of the low seasons of Iran for mass tourism but for those who are interested in off the beaten track cycling, winter is the best season for it in Iran. Cycling through the coast of the Persian Gulf or our cycling tour in Sistan and Baluchistan are one of the most amazing cycling tours in Iran. We wrote a couple of valuable articles in our BLOG like CYCLING IN IRAN, MOUNTAIN BIKING IN IRAN, 10 BEST CYCLING ROUTES IN IRAN, BEST TIME OF CYCLING IN IRAN, NORTH TEHRAN MOUNTAIN BIKING IN CENTRAL ALBORZ MOUNTAINS, 11 BEST MOUNTAIN BIKING DESTINATIONS IN IRAN, BEST MONTH OF MOUNTAIN BIKING IN IRAN and you can contact us for more information regarding your cycling holiday in Iran.