Hmm. You might call Niagara Parks in Ontario for their recommendation. In general, it looks like the mid to late October is the peak in that region, the display being delayed by the warmer water and microclimate (according to the Niagara Falls State Park on the U.S. side), but that can vary each year depending on various factors.
The following site from Yankee Magazine offers a live fall foliage map which extends to the Niagara Falls area on the U.S. border. As of November 11, for example, the area around Buffalo, New York is reporting still at peak, but a tiny bit north, along the shore of Lake Ontario, the fall foliage display has ended. [Here in southeastern NH, at elevation 1,440 feet, on November 11, most leaves have fallen, but there are a few trees still clinging on to their leaves, in russets, browns, and a few deep golds. Most reds, bright oranges, and yellows are gone.]
My guess is that September 30 would show a few spots of color on some trees, but the color display would not be in full gear yet, and not many leaves on the ground (and not many bare branches). However, October 28, you might be past peak, with many leaves on the ground and perhaps not as many colorful leaves still on the trees.
For more information, you might be interested in the following:
There are several webcams of Niagara Falls — you might check them for an idea of what November looks like there, to give you an idea of late October, perhaps.
Hmm. You might call Niagara Parks in Ontario for their recommendation. In general, it looks like the mid to late October is the peak in that region, the display being delayed by the warmer water and microclimate (according to the Niagara Falls State Park on the U.S. side), but that can vary each year depending on various factors.
The following site from Yankee Magazine offers a live fall foliage map which extends to the Niagara Falls area on the U.S. border. As of November 11, for example, the area around Buffalo, New York is reporting still at peak, but a tiny bit north, along the shore of Lake Ontario, the fall foliage display has ended. [Here in southeastern NH, at elevation 1,440 feet, on November 11, most leaves have fallen, but there are a few trees still clinging on to their leaves, in russets, browns, and a few deep golds. Most reds, bright oranges, and yellows are gone.]
https://newengland.com/seasons/fall/foliage/live-fall-foliage-map/
My guess is that September 30 would show a few spots of color on some trees, but the color display would not be in full gear yet, and not many leaves on the ground (and not many bare branches). However, October 28, you might be past peak, with many leaves on the ground and perhaps not as many colorful leaves still on the trees.
For more information, you might be interested in the following:
https://newengland.com/category/seasons/fall/
https://newengland.com/today/seasons/fall/weekend-foliage-planner-new-england-fall-trips/
There are several webcams of Niagara Falls — you might check them for an idea of what November looks like there, to give you an idea of late October, perhaps.
Hope this helps!