So … I’m not crazy after all. I’ve always felt that Detroit was in Zone 6 … and I was in good company, as many zone maps showed a microclimate around Lake Erie and Lake St. Clair that mirrored the intensely built up cities around them.
Cities bleed heat: ergo, Zone 6.
Now I note that Arborday.org has re-assigned the entire region to Zone 6 … which leads me to suspect that Detroit is now effectively in Zone 7. So here’s a search box for you. Plug in your zip code and, if it’s in a major city, consider adding (1) to the zone shown.
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