Gardening & Landscaping
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Frost Question

So I apparently didn't pay attention during grade school science, and now that I'm a new gardener, I'm trying to figure out the basics of frost prediction and formation. 

As far as my minimal research has gotten me, I gather frost has a lot to do with surface temperature.  I live in a third floor condo, and my tomato plants are on my balcony, several feet from the ground.  Given that I'm not exactly close to the ground, is frost still a concern I should look into? 

Re: Frost Question

  • As you said, its more about surface temperature.  If its cold enough for moisture to condense to frost, then your plants could freeze and die.  It really doesn't matter that you're off the ground.  Being on the ground is probably better actually because the ground is probably warmer than your 3rd floor balcony would be.

  • If the overnight lows are around 40 or less, I don't put plants out.
  • A gardener on NPR said that you shouldn't plant tomatoes until nighttime lows are consistently in the mid 50s. So that should avoid the frost conundrum and give your plants the best chance at flourishing.
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  • MisNMisN member
    Fourth Anniversary

    I think it's still a little early to leave you tomato plants outside at night on a balcony.  You could bring them in a night or use a frost cover.

    Some plants are frost hardy (e.g. pansies) but not tomatoes:(

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