Planting bulbs (very) early

Received some Lillium and Fritallirie bulbs from my brother for Christmas however after he bought them he noticed it did say to plant them in August. I could wait but I am sort of worried they will just dry out and die if left in a cupboard for that long, but maybe that's wrong.

If I did plant them in the spring then is there a chance they would just rot in the ground or would they survive to flower the next year? I am up in the north east of Scotland if that makes a difference.

I'd put them in a well drained pot and then in the cold frame. Put a bit of fine netting over the top - mice have always enjoyed tucking into my fritillaria bulbs for some reason.