Though ticks can be spread through chipmunks, the risks are very small in relation to:
https://www.ontario.ca/page/lyme-disease#_Check_your_pets
Blacklegged ticks (also called deer ticks) live in woodlands, tall grasses and bushes – and thrive in wet environments.
They are most commonly found in areas along the north shores of Lake Erie, Lake Ontario and the St. Lawrence River.
"Not all blacklegged ticks carry Lyme disease. A tick must be infected by the bacteria causing Lyme disease in order to pass it on to you.
While the probability is low, it’s possible to encounter an infected tick almost anywhere in Ontario
Ticks are most active in the summer months, but can be found at any time of the year when the temperature is above freezing."
Infected ticks are commonly found in these areas:
Long Point Provincial Park on the northwest shore of Lake Erie
Turkey Point Provincial Park on the northwest shore of Lake Erie
Rondeau Provincial Park on the north shore of Lake Erie
Point Pelee National Park on north shore of Lake Erie
Pinery Provincial Park on the southeast shore of Lake Huron
Rouge Valley/Rouge Park on east side of Greater Toronto Area
Prince Edward Point National Wildlife Area on northeast shore of Lake Ontario
Wainfleet Bog Conservation Area on the Niagara Peninsula
Infected ticks are becoming more common in the Rainy River area of northwestern Ontario.
Blacklegged ticks spread to new areas of the province because of climate change and warmer winter temperatures. They can also spread by traveling on birds and deer.