It looks like last night was frost free for me, but its blowing a gale this morning.
Hollyhock my greenhouse is 2x a dreamhouse from an american company flowerhouse.com they actually sell for $300 each but i got the pair for €140 in a stock liquidation.
They are a combination of a spring steel frame (a bit like a giant pop up laundry hamper) and fibreglass poles which form arches across the front back and middle and a centre ridge pole. The doors have and windows have an inner fly screen and there are zips on the front and rear to add sections to it. there are even little velcro flaps so you can run a hose through. I have a spray hose which i can run round so watering can be as simple as turning on a tap for 20 minutes or so.
The weak points are wind they need tying down well i have kerbstones all round it weighting it down. and the metal brackets that make the angle between the walls and roof they can get bent and once bent they are pretty useless. They also run into problems if too much snow sits on the roof (not been a problem for me).
Anyway this morning will start with real coffee and then fleece off ... not sure what I can do gardening wise maybe a few more seed trays