Parsley and Caraway are biennials.
Lovage, Spearmint and Peppermint are perennial.
What other herbs would be either biennial or perennial here?
Which Thymes are hardiest?

I struggle with thyme, but have found the red creeping to be reliable for me. Perennial herbs that do well in my zone 8: horseradish, melissa, bee balm, echinacea, sea holly, lovage, helenium, comfrey, fleabane, fennel, garlic

More iffy herbs: rosemary, any in the artemesia family, lavenders, arnica did well for about 3 years then just went away, ajuga, horehound, curry plant

Zone 3 is tricky for herbs... for many things I imagine! Brrr. Both English and French thyme (culinary) are worth a shot. Others you might try: Chives (Allium schoenoprasum) which should work fine, as should echinacea (Echinacea purpurea), comfrey (Symphytum officinale), and catnip (Nepeta cataria). Most of the others, you'll have to do in pots or plant them for a while and then dig them up so that you can move them inside.

Thank you both for good ideas.
I do have horse radish and chives growing through our winters.
My neighbour has comfrey.
Most will need to be in containers so they come in for winter here.
Thymes sometimes come through.

Actually we are now zone 4a according to Environment Canada.
They use a system which includes factors other than just temperature.
Altitude, precipitation etc.

I'm not sure about oregano or sage they both do well in my zone 5

I have had some luck with some perennials that need warmer winter weather than I have here by putting flat stepping stones near the base of the plants ,seems to keep the soil just a tad warmer
also when I have lost a perennial herb it is almost always due to the too wet conditions over the winter into spring, so good drainage is a must.

good luck adding to your herb collection

Good ideas Cinda!