It's very difficult for anyone to state accurately @zakzak, because it varies according to conditions. As @pansyface says - they don't appreciate frosts, as they aren't hardy enough, but they also need reasonably consistent overnight temps - in double figures, so you need to consider that before putting them out, and they need to be nice and sturdy and healthy too, so that they can cope with a bit of hit and miss weather if/when it happens. A wet, windy exposed site isn't ideal either, so you need a sheltered warm one, and if you don't have that, they need to be grown undercover. Outdoors rarely works well enough here where I am. It's too wet and cool, and even thought the last two summers have been considerably different, I'm not going to consider growing outside, apart from the odd extra plant if I have it, and they're up against the house wall, sheltered, when I do it.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Can you bring them in at night if required, or if bad weather forecast?
One of my Romello plants started 19th Feb has started flowering, so it's outside in a mini green house the next 4 days when clear blue skies forecast to take full advantage of the sun. It will be brought in after 6pm
A shed isn't really suitable as there isn't normally enough light in them. That's necessary for tomatoes. If you don't have a greenhouse or similar, and you don't have room inside just now for them, you may need to rig something up with plastic sheeting, and put them outside through the day there and in at night as @Glasgowgardener777 is doing.
I don't sow mine until mid March or later, because they aren't going to be outdoors as such, and a couple of months from sowing is about right for going in the gr'house. I wouldn't have room in the house, with all the other small plants I have on the go as well, to keep them inside as larger plants.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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A wet, windy exposed site isn't ideal either, so you need a sheltered warm one, and if you don't have that, they need to be grown undercover.
Outdoors rarely works well enough here where I am. It's too wet and cool, and even thought the last two summers have been considerably different, I'm not going to consider growing outside, apart from the odd extra plant if I have it, and they're up against the house wall, sheltered, when I do it.
I live in west central Scotland - not where that photo is...
One of my Romello plants started 19th Feb has started flowering, so it's outside in a mini green house the next 4 days when clear blue skies forecast to take full advantage of the sun. It will be brought in after 6pm
I don't sow mine until mid March or later, because they aren't going to be outdoors as such, and a couple of months from sowing is about right for going in the gr'house. I wouldn't have room in the house, with all the other small plants I have on the go as well, to keep them inside as larger plants.
I live in west central Scotland - not where that photo is...