Just returned from Kumrat a week back, it would be cold by time you are planning it was cold already after sun is out, dir and even until That road is fine...
After Thal there is no road at all but a track an offroad one, which is highly dangerous slippery specially if it rained so beware travel accordingly.
after Kala pani pond there are some freakingly heavy stone paths which bounce your bike really really bad so there youw ill have to be extra cautious.