Jack Frost, Where Art Thou?

Not so much to nip at my nose (or is it toes?). Just to kill all the flippin' ragweed pollen, so that poor Jazz dog doesn't have to be all doped up on Benadryl. Yep, my poor little pup (okay, she's almost 10) has wicked seasonal allergies that cause her paws, chest/underarms, and eyes to itch. Thankfully, this year it only kicked in (the itching/scratching/gnawing) around mid-August, which is a whole month later than usual. It has also subsided a bit in the past couple of days. There were rumours of a frost in the Ottawa Valley (further northeast) a few days ago, so maybe some of the pollen was eradicated. I just want a good, hard frost - I'm even willing to bid farewell to my annuals just to see the dog more comfortable (and shedding less!). Then it can go back to being nice, at least until mid-November. Is that asking too much?