I would think so. You still have plenty of time for new growth to emerge and harden off before frost.

That's fine, you need to prune Indian Hawthornes after they flower anyway, mine have just finished. As far as hollies, now is a good time, I like to prune mine right after that new spring flush has occured, in my experiences, this allows me to only have to do light prunings throughout the summer

Thank you both. I want to cut them back hard so I thought it might be too hot now and I didn't know if the hollies would have more growth after the spring flush.