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Can anyone tell me how low the temperature can go in my garage before I need to start to worry about my bonsai's?

I have fig trees (8 years), Dawn redwoods, junipers, a sweet gum tree (3 years), Japanese maple (2 years) all in shallow pots and under 8 years old. pictures are below. I have put leaves on top.

Right now the garage is 31°. For the next week it's supposed to be in the teens at nighttime and in the upper 20s to low 30s during the day.

Please let me know your thoughts I took pictures below to give you a better idea at What looks like in the garage.

I see no pictures.

31F in C = -0,5Celcius.
That is for most species ok, but for the Fig's that might be an issue.
I know in USA there are some figs with can tollerate more frost then others, but for that we need to know the cultivar of the figs. But most figs i know, will not tolerate any frost. Beter to keep those above freezing level. for example at 5Celcius.

Rorror wrote:

I see no pictures.

31F in C = -0,5Celcius.
That is for most species ok, but for the Fig's that might be an issue.
I know in USA there are some figs with can tollerate more frost then others, but for that we need to know the cultivar of the figs. But most figs i know, will not tolerate any frost. Beter to keep those above freezing level. for example at 5Celcius.

Edible figs of specific varieties take -15 I have a 5 metre tall one in the garden (And a 15cm tall one in a pot) to proove it.

As you said, depends a lot on varities.

I believe I have a Brown turkey fig. I have kept it in the garage for the past eight years but this is the first time in a bonsai pot.

Last week the temperature in the garage went to 27°F. At what point should I think of putting a heater in?

Thanks!

I'm Going to try to post the pictures again.

Brown turkey is what we have in the garden. Last year at sustained -10 to -15 for over a week it lost some branches.

At -5 and below I would seriously start protecting the roots against further frost.

No need for heating. They be better out without it.

its risk of consumption and for not much