I agree on the cow moose with a calf statement. My first hand experience with them is that they're not afraid to charge you any time of the year. When I lived in Alaska and we were out in the bush, I have been charged/chased on two seperate occasions by a cow moose with a calf. Luckily we were fast enough and were able to scatter into the trees. Neither of them followed us very far before they turned back.

My advise with bull moose though, just keep your eyes and ears open. Your nose too. They can smell pretty musky around the rut, but they're not there yet. They're just now probably getting around to scraping the velvet off of their antlers, so they've got some time for the rut yet. They can be a little more agressive during the rut, but it isn't like they're going to come looking for you, lol.
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In all things of nature there is something of the marvelous.-Aristotle