Env. Can. has put out frost warnings for the central Ontario regions like Algonquin and Bancroft areas. For our region, there is a "risk of frost" with the predicted overnight low of 3 C.
Assuming that frost won't occur this evening (and I don't think it will), I am starting a poll with your predictions as to when the first frost will hit. And just so we're clear, I am defining first frost as 0 C or lower as measured at the Ottawa A/P. The airport climate data stream has had issues since to the switchover to NAV Canada collection services and has only just recently has historical daily data available online. If there is a further issue, Ottawa CDA will be the substitute.
Submit your predictions in the comments. Winning pollster will get...I'm not sure.. bragging rights?