I came across a very useful link recently, that I hadn't seen before - I'm sure it will be useful to others here.
The link provides a range of plant maps based on climatic zones (e.g. using the USDA plant-hardiness classification) and dates for the last expected frost, etc. You can zoom in to any of the maps to get more details for specific towns & cities. It has maps for European countries, e.g. UK, Ireland, France, Iceland, Belgium, Netherlands, Norway and if you click on the
Plant Maps tab it will open up some maps for North America.
https://www.plantmaps.com/interactive-united-kingdom-plant-hardiness-zone-map-celsius.php
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