Hardening off?

Hi in early Jan i sowed some salvia, sweet peas and red hot poker they have been inside since then. However now i have brought a 6ft plastic greenhouse and i want to put them in there because i havent got room for them inside now. I have been putting them outside everyday for a week now and then bringing them inside at night they seem to be ok do you think they would could go out yet thanks:gnthb:

 

I bought some young red hot poker plants last weekend which have been sitting outside for the past week with no ill effects (and temperatures dropping below freezing several times). So they should be fine.

I think the sweetpeas and salvia might need more protection - not sure how much those plastic greenhouses give from the frost?

Maybe risk it with a couple of each to see what happens (not putting eggs in one basket mentality)?