How hardy are sunflowers and ornamental gourds?

Can I start taking them for daytime walkies now that temperatures are forecasted to stay around 10c or above? Or are they like cucumbers that prefer room temperatures and get all upset with the slightest change?

I have my Giant Mongolian sunflowers, some white Italian heritage ones and a mixture of ornamental Gourds, all with second pair of true leaves now.

I've never grown these before so would appreciate advise. Thanks!

 

Sunflowers should be ok.
Not so sure about the gourds, probably a bit more tender, I've never grown them but would expect similar conditions to courgettes would be about right.

 

Thank you, @pete and @JWK, very helpful!