If you plan to visit Spiti between March-May, you will have to take the Shimla-Spiti route, which makes the valley accessible throughout the year. This route passes from Shimla – Narkanda – Rampur – Kalpa - Nako-Giu Village - Tabo Village – Dhankar - Pin Valley (Mud Village) – Kaza
If you are travelling in June-September, you can access Spiti from the Manali side. The route, in this case, will be Manali – Solang Valley – Rohtang Pass – Gramphu – Batal – Chandratal – Kunzum Pass – Losar – Kaza
In winters, Spiti is accessible only from the Shimla side. The available route passes through Shimla – Narkanda – Rampur – Kalpa - Nako-Giu Village - Tabo Village – Dhankar - Pin Valley (Mud Village) – Kaza
The best season to visit Harsil is in between April to June and September to October. The climate remains pleasant during these months offering tourists the best holiday experience. Summers are pleasant with moderately cool climate in Harsil.
Weather Harsil april:
On average, it is maximum 29° in april in Harsil and at least around 15° degrees. In april there are 7 days of rainfall with a total of 19 mm and the it will be dry 23 days this month in Harsil.
https://www.euttaranchal.com/tourism/harsil-weather.php
Take Taxi the most conevnient way. However, you can get Bus till Aut tunnel.or.kullu from Jibhi or banjar as you may find. And then bus to bhuntar and kasol
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