What's The Earliest I Can Put Tomatoes Out?

Mr FootOfDavros

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I've got one of these plastic grow houses which sits against the house wall and can be zipped shut initially.

Looking at my pictures from last year, they went out on May 7th. But the thing is, until last week, the spring here was amazing and they've shot up really fast - got a couple with the first trusses developing already.

Would I get away with them going out now? Don't think we're going to get any freezing overnights, forecast showing 4/5 degrees celsius minimum...
 

oneeye

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I've got one of these plastic grow houses which sits against the house wall and can be zipped shut initially.

Looking at my pictures from last year, they went out on May 7th. But the thing is, until last week, the spring here was amazing and they've shot up really fast - got a couple with the first trusses developing already.

Would I get away with them going out now? Don't think we're going to get any freezing overnights, forecast showing 4/5 degrees celsius minimum...
I know how it feels when I have a bunch of pretty plants growing and then hit with a frost or freeze. Its all depends on how many you can lose and still have to grow later. Don't take a chance if you only have a few; just wait until you know for sure. Keep us posted.
 

Mr FootOfDavros

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I know how it feels when I have a bunch of pretty plants growing and then hit with a frost or freeze. Its all depends on how many you can lose and still have to grow later. Don't take a chance if you only have a few; just wait until you know for sure. Keep us posted.

Thanks. I've got four each of two varieties so could maybe risk some out.

I think these 4/5 degrees nights will be the lowest left over the next week and hopefully okay after that. So might hold off a few more days and then get three out in the grow house. I just don't have space for them to get more bigger together in our indoor window sill which gets the sun!
 

yardiron

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I've always had the best results when I wait till the overnight temps are constantly remaining above 60°F (15.6C). Its been my experience that most tomatoes simply don't thrive until the ground itself begins to warm and the nights are no loner chilly.
My plants usually don't hit their growing stride and set fruit till the temps get into the mid to upper 80's here.
Last season I didn't get my plants in till the last week in May, I nearly planted them in late April but the weather turned cooler and we had snow flurries in mid May. The cold snap didn't last but it certainly would have stunted or shocked their growth early on if not killed them altogether. Its happened several years in a row here and my growing season has gotten later every year now for the last 12 or so years.
 

Mr FootOfDavros

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I've always had the best results when I wait till the overnight temps are constantly remaining above 60°F (15.6C). Its been my experience that most tomatoes simply don't thrive until the ground itself begins to warm and the nights are no loner chilly...
Thanks for the reply.

Re what you are saying there, are you putting them into the ground itself?

I'm putting them into a grow bag and not only that but a halo sitting above the grow bag, so I wonder if that makes a difference?

e.g. Here was the set up on May 7th, last year:-
IMG_20240507_145707_copy_1200x1600.jpg


So they were in there, a bit off the actual ground, with the house zipped closed at night for the first few weeks.

I've managed to hold off for now but I think I'm going to have to shift some of them out soon as they're getting too big on the window sill...
 

yardiron

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Thanks for the reply.

Re what you are saying there, are you putting them into the ground itself?

I'm putting them into a grow bag and not only that but a halo sitting above the grow bag, so I wonder if that makes a difference?

e.g. Here was the set up on May 7th, last year:-
View attachment 108289

So they were in there, a bit off the actual ground, with the house zipped closed at night for the first few weeks.

I've managed to hold off for now but I think I'm going to have to shift some of them out soon as they're getting too big on the window sill...
For me, they go from being seeded indoors, they spend a few weeks in the first containers till I see the first permanent leaves, then I transplant them to greenhouse flats. They get put outside in an enclosed screen porch that remains covered in plastic until May or so. They get brought inside overnight to prevent issues from the cool nights or frost.

I generally start my seeds about mid March, about a week before the first day of spring, The seeds are generally sprouting within a week.

Once transplanted into the flats they get separated by size too. Those that sprouted later go in a separate flat to be planted in stages come time.
My youngest plants right now are about 4 inches tall.
They will go into the garden last.

Between now and when the plants or when the weather allows me to plant they will slowly get moved outdoors in the sun for longer periods each day being brought back into the porch every night that the temps drop below 50°F or so. In two weeks the older plants will have reached about 12 inches tall and I'll start prepping the garden for planting.

I have more plants this year than last but far from the most I ever planted.
More seeds were successful this year than usual and I've got more than double the number of viable plants. Not every plant will survive to maturity once planted, but most will. I lost a few last year to groundhogs but made smaller mesh wire cages to protect them this year.

I also plant several test plants in a raised garden each year, so a half dozen plants will go in there as well. Its where I test any new ideas or plants I've not grown before.

I planted earlier a couple of times having plants in the ground by May 1 but they didn't do much growing for a good month afterwards and I spent too many nights covering up plants when frost was likely.

There's also the matter of wind damage, this time of the year we get a lot of wind, seeing 50mph gusts and rain is common and the wind has been getting worse lately. Back in 2012 we had a huge storm the last day of May and nearly every plant got ripped out of the ground, stakes and cages got toppled and debris from nearby yards and trees was strewn all over the garden. I lost 1/3 of my tomato plants. Luckily I had planted 50 that year. The wind ripped all my squash plants out, debris fell on and broke off all the pepper plants and stripped all the leaves off two row of beans. They called it a derecho. Since then I double up on what I plant and always have a second set of plants that are a few weeks behind the first.

That way if a storm, frost, or critters damage something that space has a standby ready to go in its place. Once everything is established, hopefully but the end of June, any extra plants either get given away, put in large pots up by the house, or planted around the yard in other garden areas. I even dug up and made a smaller garden by my side door one year to put four extra tomato plants in. It did okay but didn't get my full attention and being close to the house it lacked sun part of the day. It still gave me a few extra bushels of tomatoes that year though.
 

Mr FootOfDavros

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Looks like you're on a much bigger scale than me!

Actually though, I got pretty much every seed come up but I was using hybrid cherry and Crimson Crush. So I have four of each plant.

Three will go in that grow bag / house setup. I'm going to try three in large pots with those halos on top. These will be at the back of our house.

The rest probably will go directly in the ground, at the front. Because of our house being a semi and the direction it faces, the ones at the front don't get direct sunlight until the afternoon (sounds a bit like that setup you tried with the partial sun). Anyway, I didn't think they'd work there but they came up last year - although didn't ripen quickly enough before the weather turned.

I see you're in New Jersey. I spent a summer there once many years ago, so I can appreciate the more extreme weather challenges you may face there.

I'm sure all the extra sunshine helps (it's only my second year doing this but I think the big issue here is whether we get enough sunny days, even over summer, to ripen them quickly enough / encourage growth) but I remember some incredible summer storms when I was there. I guess you need some really good drainage and have everything really well staked as well to stop them getting destroyed.

Anyway, good luck with your setup this year. Fingers crossed for a decent summer...
 

Oliver Buckle

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You are a lot further North than me in E. Sussex and I read somewhere my last possible frost date has moved this year from mid May to the last week of April, not that there looks like being a frost this week. Google tells me for Edinburgh it is between May the 1st to the 10th and safe after that, however, if they have some shelter ... For my potatoes I have two sets of old net curtains I cover with if the forecast looks dodgy. I would go with the belt and braces approach, some out, others not. If they are then all okay I would be looking at which did better in the long run.
 

Mr FootOfDavros

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You are a lot further North than me in E. Sussex and I read somewhere my last possible frost date has moved this year from mid May to the last week of April, not that there looks like being a frost this week. Google tells me for Edinburgh it is between May the 1st to the 10th and safe after that, however, if they have some shelter ... For my potatoes I have two sets of old net curtains I cover with if the forecast looks dodgy. I would go with the belt and braces approach, some out, others not. If they are then all okay I would be looking at which did better in the long run.

The forecast I'm looking at here has 4 degrees tomorrow and then a run of 8/9s, so I'll wait until after tomorrow I guess then go for it.

My trouble really was that the weather was consistent so good here for a few weeks that they shot up a lot quicker than last year. Maybe the different varieties played a part as well I guess. But they're all maybe a foot and a half now and really outgrowing their little pots:-
IMG_20250423_095407_copy_1600x1200.jpg


One of them has even got a couple of trusses going already!

What I might do actually is my plan but in reverse, i.e. put three out into pots rather than the grow bag / house so I can bring them back in if a particular cold night does come up. Then the others would have a bit more space as well...

Only issue is, I don't think they have any nutrition left to get in these little pots - a few have lower leaves starting to yellow and even the feed isn't enough.
 

Mr FootOfDavros

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Have you checked under the pots to see how much root is showing?
Yeah. These pots only have four little circle holes in the corners but there's roots showing there in all of them.

When I took them out last year it was great because it was a solid root block pretty much, which I just put in the centre of the halos and put compost around. So I'd imagine they're in a similar state now.
 

yardiron

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The weather here is warming quickly too, its 7:45am here and we have 14°C outside, its supposed to go to 25° before today is out but the nights later in the week are predicted to get down around 4°C later this week. That's too cold for tomatoes, at least the varieties we grow here. It won't kill them but it does stunt them or prevent them from thriving.
The weather this year is much like the last two years, but we had a colder winter than in recent years with several cold snaps below -12°C for more than a week. We've not been that cold in quite a few years in the past. It killed off a lot of plants that normally prefer more temperate climates. Most of the neighbors here had started to plant bananas and a few colder tolerant palm trees but those all seem to have been wiped out by the deep freeze.
We were warmer this time last year but with cooler night temperatures.

I'll probably start to prep the garden this weekend if its not raining. I'll get the ground tilled and the tomato cages in place, and maybe chance a couple plants in a week or two. I was hoping to rework the garden layout a bit this year but that may not happen. I have a huge tree that I want to remove that's been dropping limbs for a few years and once that's gone, I can take that area as growing space as well but for now the tree still stands.

I'm probably about 1,800km or so further south here than where your at but the weather is likely similar much of the year. We likely get a later winter here though. Our lowest temps are generally in Jan and Feb. and it starts to warm up in March. They're predicting a hotter than normal summer this year again, but they also predicted a warmer than usual winter and we had one of the coldest in decades. Time will tell.
 

Oliver Buckle

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What I might do actually is my plan but in reverse, i.e. put three out into pots rather than the grow bag / house so I can bring them back in if a particular cold night does come up.
B&Q sell cheap orange buckets at £1 each and I grow in them with a 3/4" hole drilled in the centre of the base and 6 smaller ones around it. It is so much more convenient having a handle to move them about, your forecast is very similar to mine, but you never know with British weather, it comes of being an off shore island, North sea one side, Atlantic the other. People who live in the middle of continents know just what their weather will be like.
 

Mr FootOfDavros

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B&Q sell cheap orange buckets at £1 each...

Damn! I completely forgot about those! 😂

Saw them last year and said to Mrs Davros they'd be ideal and cheap! So I'm thinking I've done alright getting two big pots from Lidl in a 2 for £10 offer, when actually 2 for £2 can't really be beaten!

Actually maybe I'll still get a couple for my cucumbers. Was going to recycle 12l pots my red robin hedging came in last year but they might be a better option.
 

Oliver Buckle

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I do worry slightly about the plastic, I keep meaning to ask the local fast food outlets if they get ingredients delivered in buckets, it would be food friendly plastic, and they are usually a bit bigger as well, must get round to it one day.
 

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