Investing in alt-coins is a very risky business at anytime, because anything can happen in alt-coins, because most of alt-coins can be dumped, even in the Bull Run market session. But most of them are very good profitable business all depends on the alt-coins you're investing into. And secondly, what matters in alt-coins investment is the entry point of buying that determines profits of exit point of selling, so do your research before investing in any alt-coins.