Two things are published and one is not. Published: the temperature range indoor plants tolerate and the point at which chill damage is warned about. Not published: what the air actually does in the six inches between an old single-pane window and a pot standing on the sill.
That gap is why so much winter advice is vague. This page keeps the published parts, names the missing one, and replaces it with a measurement you can make in your own apartment with a thermometer.
If you already have cold damage on a plant and want to know what the marks mean, that is a diagnosis question and belongs elsewhere. This page is about which plant to put there and how far back to stand it.
Every source below was read on August 28, 2026, and linked so you can check it.
The published numbers
University of Georgia Extension gives the whole frame (UGA Extension, Bulletin 1318, read 2026-08-28):
- The tolerated range: "Interior plants can tolerate and grow well in the 58 °F to 86 °F range because most indoor plants originate from tropical and subtropical areas of the world."
- The preferred range: "The best temperature range for indoor plants is 70 °F to 80 °F during the day and 65 °F to 70 °F at night."
- The warning: "Be especially careful not to allow temperatures to drop below 50 °F, or chill damage will result on some sensitive foliage plants."
Three points worth pulling out.
Fifty degrees is a warning line, not a death line. The sentence says chill damage will result on some sensitive foliage plants. It is a threshold to stay above, and different plants sit differently against it.
Fifty-eight is where "tolerate and grow well" stops. So the band between 50 °F and 58 °F is neither comfortable nor catastrophic, and a lot of winter sills live exactly there.
Nights are supposed to be cooler. The preferred range wants nights about five degrees below days. A window that cools at night is not automatically working against the plant. It becomes a problem when it goes past the floor, not when it goes down.
The measurement nobody has made for you
Nobody publishes the temperature of a windowsill. It depends on your glazing, your building, your climate and your heating, and the honest position is to measure rather than estimate.
The set-back test. On the coldest night you get, put a thermometer on the sill, hard against the glass, and read it late at night. Then move it back four inches and read again the next night under similar conditions. Repeat until the reading sits comfortably above UGA's 50 °F line, and preferably inside the 58 °F to 86 °F range.
The distance at which that happens is your set-back, in inches, for that window. It is the number this article exists to help you find, and no page written for someone else's building can give it to you.
A few things that make the number worse, all of them worth checking with the same thermometer: single glazing, a gap you can feel around the frame, a metal frame, a north aspect, and a curtain drawn between the plant and the room. That last one catches people out. A curtain closed at night puts the plant on the cold side of the insulation, in a pocket that is colder than the room. If your plants sit behind the curtains, either move them into the room at night or leave that section of curtain open.
Which plants have a published cold floor
Very few plant profiles publish a temperature figure. These do, and for this spot the figure matters more than the light description.
| Plant | Published cold note, per NC State | Suitability for a cold sill |
|---|---|---|
| Spider plant (Chlorophytum comosum) | "Keep temperatures above 45 degrees F" | The lowest published floor on this list, below UGA's general 50 °F warning. Also "intolerant of direct sunlight," so a bright south sill is a different problem |
| Snake plant (Dracaena trifasciata) | "Tolerates low humidity and cool temperatures around 50 degrees" | Sits right at UGA's warning line by its own published description, and tolerates the dry heating-season air too |
| Cast iron plant (Aspidistra elatior) | "Keep sheltered from winter winds" in colder regions; hardy in USDA zones 7a to 11b | The zone hardiness is an outdoor rating, but it is the only plant here with any published cold-weather line at all, and it tolerates the low light of a north window |
| Monstera (Monstera deliciosa) | "An average warm temperature of 60 to 85 degrees F" | Its published floor is above UGA's tolerated minimum. Keep it off a cold sill |
| Fiddle leaf fig (Ficus lyrata) | Best above 55 °F; "sensitive to overwatering and temperature fluctuations" | A cold sill next to a heated room is a fluctuation. This is the wrong plant for it |
Sources: NC State Extension, Chlorophytum comosum, Dracaena trifasciata, Aspidistra elatior, Monstera deliciosa and Ficus lyrata, all read 2026-08-28.
The spider plant and the snake plant are the two with published floors at or below UGA's warning line. That does not make either of them frost-proof; it makes them the two whose publishers have said something specific about cold, which is more than can be said for most of the plants sold for windowsills.
The trade you are actually making
Standing a plant back from cold glass costs light, and in winter that is expensive.
Illinois Extension's distances are the ruler (Illinois Extension, houseplant lighting, read 2026-08-28): low light reaches "3-10 feet away" from an east or west window and only "a few feet away" from a north window. A set-back of a foot or two is nothing beside a south window and can be most of your usable range beside a north one, which is the site's hardest aspect and the subject of our north-facing window guide.
There is one piece of good news in the seasonal direction. Illinois notes that "the sun is higher on the horizon in the winter (increasing the brightness indoors)," so the months when you most need the set-back are also the months when the light reaches deeper into the room. That does not apply to a north window, which gets no direct sun to push deeper, but for east, west and south it partly pays for the distance you have given up.
Placement moves, ranked by cost
- Move back, by the distance your thermometer gave you. Free, reversible, and the only move with a number behind it.
- Move along the window to the part of the sill away from the worst of the frame gap. Test both ends; they are often different.
- Move the plant into the room at night and back in the morning. Tedious, but it is the move that keeps the daytime light and removes the coldest hours.
- Move off the sill for the season. A plant that lives on the sill from March to November and on a table from December is a reasonable arrangement, not a failure.
- Leave the curtain open on that section. Costs nothing, and it is the mistake most often made without noticing.
What this page will not do is advise you on glazing, plastic film, draft excluders or building repairs. Those are your building's business, and a plant is not a good reason to modify a window.
Our spot-by-spot apartment placement guide covers the alternatives inside the room, and a kitchen windowsill has its own version of the same set-back trade with steam and cooking heat added.
The cold-window checklist
| Step | What you are checking |
|---|---|
| Thermometer on the sill against the glass, coldest night | Your worst-case reading |
| Move back four inches, repeat | Where the reading clears 50 °F, then 58 °F |
| Both ends of the sill | Frame gaps are rarely symmetrical |
| Curtains at night | A drawn curtain puts the plant outside the insulation |
| Plant choice | Prefer one with a published cold floor |
| Cost in light | Check the set-back against the Illinois distances |
| Seasonal plan | The window is a different spot in June |
Frequently asked questions
How cold is too cold for a houseplant on a windowsill?
UGA Extension warns against letting temperatures drop below 50 °F, saying chill damage will result on some sensitive foliage plants, and puts the "tolerate and grow well" range at 58 °F to 86 °F. No source publishes the temperature of a windowsill, so measure your own on the coldest night you get.
How far back from a cold window should plants sit?
No publication gives a distance, because it depends on your window and your climate. Find it with a thermometer: move the reading back four inches at a time until it clears UGA's 50 °F warning line, and preferably sits inside 58 °F to 86 °F.
Which houseplants tolerate a cold window best?
Of the plants with a published figure, the spider plant has the lowest floor at "above 45 degrees F," and the snake plant is described as tolerating "cool temperatures around 50 degrees" along with low humidity. Both statements come from NC State Extension profiles.
Should I close the curtains to protect plants from a cold window?
The opposite, for the plants at least. A drawn curtain puts the plant in a pocket between the fabric and the glass, on the cold side of the insulation. Either leave that section open or move the plants into the room for the night.
Is a cold windowsill worse than a dark corner?
They are different failures. A dark corner is a slow decline you can plan a rotation around. A sill below UGA's 50 °F line is a threshold the publication specifically warns about. If you have to choose, measure the sill first, because the corner's problem is predictable and the sill's is not.
Does the winter sun make up for standing plants further back?
Partly, and only for some aspects. Illinois Extension notes the sun is higher in winter, "increasing the brightness indoors," which pushes light deeper into east, west and south rooms. A north window gets no direct sun, so it gets none of that compensation.
A note on pets
Sills are reachable in many homes and cold-weather plant moves put pots in new places. Whether a species is a risk to an animal is not something this site rules on. Check the plant by name against the ASPCA's toxic and non-toxic plant list, and take anything that has actually been eaten to a veterinarian.
Sources
- University of Georgia Extension, Growing Indoor Plants with Success (Bulletin 1318), read 2026-08-28, for the 58 °F to 86 °F range, the 70 °F to 80 °F day and 65 °F to 70 °F night preference, and the 50 °F chill-damage warning.
- University of Illinois Extension, houseplant lighting, read 2026-08-28, for the low-light distances by window direction and the higher winter sun increasing indoor brightness.
- NC State Extension Plant Toolbox, Chlorophytum comosum, read 2026-08-28, for keeping temperatures above 45 °F and intolerance of direct sun.
- NC State Extension Plant Toolbox, Dracaena trifasciata, read 2026-08-28, for tolerance of low humidity and cool temperatures around 50 degrees.
- NC State Extension Plant Toolbox, Aspidistra elatior, read 2026-08-28, for the winter-wind shelter note and the USDA 7a to 11b hardiness range.
- NC State Extension Plant Toolbox, Monstera deliciosa, read 2026-08-28, for the 60 to 85 °F average warm temperature.
- NC State Extension Plant Toolbox, Ficus lyrata, read 2026-08-28, for performing best above 55 °F and sensitivity to temperature fluctuations.
- ASPCA, Toxic and Non-Toxic Plants: https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants
No temperature or distance figure in this article is ours.