The usual places like Radio Locator, Clear FM etc. only cover the USA and not Canada but here's a site that covers all of the US and Canada for unused FM frequencies in your city and gives 3 for each place.
This may be good for Artisan and myself in particular.
https://www.siriusxm.ca/help/installation-help/frequency-finder/
The FCC has an online frequency search tool for LPFM that looks for channels for the licensed Low Power FM service. The search tool would also be useful for those looking for a frequency for a Part 15 station that would have minimal strong co-channel and adjacent channel signals based on location.
Here is a link to the FCC search tool:
https://www.fcc.gov/media/radio/lpfm-channel-finder
I don't know how the Canadian one determines open frequencies, but the three it found for my location just didn't work.
Applying the 'listen' test, 89.7 has a fairly strong station on it (89.9 has a very weak God station from Seattle that fades out in my area and I sometimes use it)
100.9 has a strong station on it, as does 102.9. In addition to that, there are strong stations on adjacent frequencies.
The best frequency is 103.9, which is empty, and the adjacent channels are also empty. The 2nd best is 100.1 (99.9 has a reasonably weak station, 99.7 is empty and 100.3 is empty).
Moral of the story - don't just blindly follow what a website tells you, but also do the tried and true 'listen' test as well.
Doesn't seem that it's too good!
And here in Toronto it doesn't list 90.7 and 89.9 which are good and I am on and have been for a long time on 90.7 The ones listed are "OK" but the best are not there.
Wonder why A site for this can't be like clear FM and include Canada also?
Wonder why Industry Canada(ISED) doesn't put out a list of acceptable frequencies in all areas of the country for BETS-1 and RSS-210 and RSS 123 that's accurate as they know where all the stations are and aren't. All the ones that are good cover only the USA and radio locator gives for any city the best, and the second best.
Industry Canada really should, particularly for RSS123 and other licensed low power ventures (I don't think they really know/care about BETS all that much). It's up to each potential IC licensee to hire an engineer (or something similar) to ensure that their desired signal doesn't interfere with any existing stations.
It should be something similar to the Whitespace database that is supposed to exist (somewhere).
Yes they are all great and accurate, give the best and the second best but none will include Canada and the only one that does isn't that good as me and Artisan have found out.
Do a series of tests over a week. Differing times of day. Before sunset, after, noon, whatever.
Keep a log, and then keep it for later reference. The tests are a due diligence on your part. State time, etc. and any power or levels much like a ham operator would do. Record what you know and observe.
Essentially I did this for my Radio Phvern station in 2017 and found it helpful for me. But if anybody attempted to hold me to account I could whip out a log.