It is a mild October afternoon. The potted plumeria on the patio still has a few green leaves, and the forecast shows a low of 46 F by Thursday. Knowing when to bring plumeria inside ends the guesswork.
The trigger is a night temperature, not a date on the calendar.
This guide covers the numbers to watch and the frost dates that help you plan. It also walks through moving a heavy plant. For the cold limits themselves, see our guide to plumeria cold hardiness and zones.
When to bring plumeria inside: the short answer
Bring your plumeria in when night lows head toward the low 50s F. Do not let it sit outside once lows drop into the 40s. Sources disagree a little on the exact line, so it helps to see the range.
- The Missouri Botanical Garden advises moving plumeria indoors before night temperatures fall below 40 F.
- University of Wisconsin horticulture staff say to bring it in when nights drop into the 40s F.
- Iowa State Extension advises bringing tropical houseplants in when lows consistently reach about 50 F. It notes that many tropicals are damaged in the mid to low 40s.
The first two give you the last safe moment. The third gives you a comfortable one. A good rule is to pick 50 F as your plan and treat 40 F as the absolute deadline.
Night temperature triggers for when to bring plumeria inside
Daytime highs can fool you in fall. A sunny 70 F afternoon feels fine. Pots and roots lose heat quickly after dark, so the night low is the number that matters.
Lows in the low 50s F
This is the planning stage.
Growth slows and leaves may yellow and drop. Check the extended forecast and clear a spot indoors. If you have a few mild days left, you can leave the plant out while you get ready.
Lows in the 40s F
This is the move now stage.
Cold, wet roots are the main risk in a pot. A plant sitting in cold rain can go downhill fast. Bring it in on the first night forecast under 45 F if you can.
Lows near freezing
Do not wait this long. If a surprise frost hits, see our guide to assessing and pruning after a freeze for what to do next.
Cold rain and wind count too
A cold, soaking rain is harder on a plumeria than a dry, cool night. The potting mix stays wet and chilled, which is the combination that invites rot. Growers commonly report that stems turn soft after a stretch of cold, wet weather.
If rain is forecast alongside lows in the 40s F, move the plant under cover or indoors early. A covered porch helps with rain, but it does not stop the cold.
First frost dates by USDA zone
Average first frost dates are a planning tool, not a trigger.
Aim to move the plant a week or two before the typical first frost. Lows in the 40s F arrive well ahead of it. The ranges below are typical, and your local weather service has dates for your exact town.
| USDA zone | Typical first frost | Aim to bring plumeria in |
|---|---|---|
| 4 | Late September to early October | Mid September |
| 5 | Early to mid October | Late September |
| 6 | Mid October to early November | Early to mid October |
| 7 | Late October to mid November | Mid to late October |
| 8 | Mid November to early December | Early November |
| 9 | Mid December to January, in some areas rare | Late November, or when a cold front is forecast |
In zones 9 and warmer, it is often a few cold nights that matter, not a single date. Watch the forecast for cold fronts instead of moving on a schedule. Our Texas plumeria care guide shows how this plays out in a big state with varied winters.
Use a min/max thermometer
Your phone forecast is for the airport or the town center, not your patio. A min/max thermometer placed near the pots records the real overnight low, which can differ by several degrees. Growers commonly use one to learn their own microclimate.
How to move a plumeria inside
Pick a dry, mild day for the move, because when to bring plumeria inside is easier to manage before a cold snap. Do not wait for the night of the first cold snap. A little prep prevents the most common problem, which is bringing pests indoors with the plant.
Step 1: Check for pests outdoors
Look under leaves and along the stems for spider mites, mealybugs and whiteflies. Wisconsin horticulture staff note that plumeria is very susceptible to spider mites. See our pages on spider mites and mealybugs if you find any.
Iowa State Extension recommends rinsing the foliage and letting it dry before the plant goes in. It also suggests keeping new arrivals apart from other houseplants for three to four weeks. Pests often show up within about a month.
Step 2: Cut back water
Stop fertilizing and water less as nights cool. Let the mix dry between waterings so the roots are not sitting wet at low temperatures. Our plumeria water requirements page covers the seasonal changes in more detail.
Step 3: Move the heavy pot safely
A large plumeria in a wet pot is heavy and top heavy.
Use a plant dolly or a hand truck. Tip the pot onto the wheels instead of lifting it.
Wrap tall branches loosely so they do not snap in a doorway. Get a second person for big plants.
If the plant is too tall for the space, light pruning is an option. Read our guide on how to prune plumeria first. Sap is irritating, so wear gloves.
Step 4: Choose where it will live
Your options depend on whether the plant keeps its leaves or goes dormant.
- A leafy plant that keeps growing needs your brightest window or a grow light. Indoor light is much weaker than outdoor sun, so some leaf drop is normal. Our page on light requirements and grow lights has the details.
- A plant that drops its leaves can sit in a cool, dim spot that stays above freezing. The Missouri Botanical Garden suggests keeping a dormant plant just above 40 F, with no water until spring.
Full storage methods belong in our dedicated storage guide for winter, so this page stops at the move. For a broader overview, see the plumeria winter care guide.
What if you cannot bring it inside?
A plant that is too big to move can sometimes be protected on cool, brief nights. A frost cloth helps for short dips. It does not replace a warm space for a long cold stretch.
Cloth works by holding some ground heat. Drape it to the soil and remove it in the morning.
How well covers perform on potted plumeria is not well documented. Treat one as short term help only.
When to put it back outside
The Missouri Botanical Garden says to wait until frost danger has passed and nights stay above 50 F.
Harden it off over a week or so, starting with a few hours in shade. Sun after months inside can burn leaves. Our plumeria dormancy guide explains how to tell when a bare plant is waking up.
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Frequently Asked Questions
What temperature is too cold for potted plumeria?
Most sources say to bring it in before lows drop below 40 F. Many growers move it sooner, near 50 F. Cold damage can still happen above freezing, especially with wet roots.
Can plumeria stay outside until the first frost?
It is risky. Lows in the 40s F usually come days or weeks before the first frost. Waiting for frost means several stressful nights first.
Should I bring plumeria inside if it is in the ground?
You cannot move it, so protection and local cold hardiness matter more. Our guide on cold hardiness explains the limits, and in colder zones a container is the safer choice.
Do I need to water plumeria after bringing it inside?
Only a little, and only when the mix is moderately dry. A dormant plant needs no water until spring, according to the Missouri Botanical Garden.
Will my plumeria lose its leaves after I move it?
Often yes. Lower light and cooler temperatures cause leaf drop, and deciduous types like Plumeria rubra go dormant naturally. New leaves usually return in spring.
Can I use a grow light instead of a sunny window?
Yes, a full spectrum light can fill the gap if your windows are dim. Keep it on a timer and watch the plant for stretching.