Jai, If you by muscari mean the common Muscari armenicum then it will be fine. It's perfectly normal for it to put up leaves very early in the autumn. Next year when they are more established they will probably be up earlier, provided there is enough moisture. Here they are usually up by September. Even if the foliage gets a bit damaged from cold, it's unlikely to affect the blooms. I had deer chewing the leaves down to the ground during winter, yet they have bloomed the following spring.
