Low-seasons and high-seasons refer to the boom and bust season of tourism in a particular place. Meaning that a destination is full of tourists because of some factors like the weather and atmosphere, or the opposite, fewer tourists go there.
Traveling during the off-season means that you will experience the approximately lowest prices and the most secluded attractions. Off-season, for various reasons, is a time when tourists will not be very interested in a particular destination.
We can say Iran is always in high season because it has a wide geographical area and you can experience different climates in one month in various cities.
In winter, the southern islands of the Persian Gulf and southern cities are the best places to travel, while spring and summer are the best times to travel to northern cities such as Tabriz.
In general, the high season in Iran is two seasons, spring and autumn. In other words, middle of March, April, May, September, October, and early November are the busiest travel months in Iran.
You can also come to Iran in winter and summer and enjoy your trip if you choose suitable cities or you don’t mind cold weather.