Every October, right around the time I’m pulling the last tomatoes and packing away patio cushions, I turn my attention to the geraniums. They’ve usually spent all summer spilling out of porch pots and window boxes, blooming their hearts out through heat, wind, and the occasional Midwestern downpour. And every single year, I’m reminded that if I give them a little attention before the first hard frost, they’ll reward me with stronger plants and bigger, earlier blooms next summer.

Overwintering geraniums is not difficult, but timing and a few practical steps matter more than people think. I’ve learned, sometimes the hard way, that October is the month to clean them up, choose the right storage method, and set them up for a healthy rest instead of a stressful struggle. Below, I’m walking you through the critical jobs I do each fall, plus a few extra steps that make a real difference when spring rolls around.

1. Move before the first hard frost

The first and most important job is to act before a hard freeze hits. Geraniums can handle a cool night or two in the 40s°F, but once temperatures dip to 32°F or below for several hours, you risk cold damage that weakens stems, blackens leaves, and makes overwintering much less successful.

In my yard, I start watching the 10-day forecast closely by early October. If nighttime lows are headed toward 38°F to 40°F, I begin the process. That gives me a little cushion in case the forecast changes. If your geraniums are in containers, bring them in before sunset on a dry day. If they’re planted in the ground, dig them up while the soil is still workable and not soggy.

2. Decide which overwintering method fits your space

There are three reliable ways to overwinter geraniums, and the right one depends on your house, your windows, and honestly how much fuss you want to put into them from November through March.

The first method is to keep them growing indoors as houseplants. This works best if you have a bright south- or west-facing window that gets at least 6 hours of direct sun, or a grow light you can run 12 to 14 hours a day. The second method is to let them go semi-dormant in pots in a cool area, ideally 45°F to 55°F, such as an attached garage, enclosed porch, or cool basement with some light. The third old-fashioned method is bare-root storage, where plants are lifted, cleaned, and stored in a cool, dark, dry location around 45°F to 50°F.

I usually do a mix. My prettiest varieties come indoors in pots where I can enjoy them in the kitchen window, and a few extras get stored cool and quiet in the basement. Spreading your chances like this is a smart move, especially if you’re trying to save a favorite red or salmon geranium you don’t want to replace in spring.

3. Inspect every plant closely for insects and disease

Before a single plant comes indoors, give it a careful once-over. Look under leaves, along stems, around buds, and at the soil surface. Common geranium troublemakers include aphids, whiteflies, spider mites, fungus gnats, and mealybugs. A plant that looks “mostly fine” outside can turn into a full-blown pest problem inside your home within 10 to 14 days.

I check for sticky residue, tiny webbing, pale speckled leaves, black moldy-looking patches, mushy stems, and any foul smell from the soil. Remove yellowed leaves and spent flowers right away. If I find insects, I rinse the plant with a firm stream of water, especially the undersides of the leaves, then treat it with insecticidal soap according to the label. Neem oil can help too, but I use it carefully indoors and only in a well-ventilated spot.

It also helps to isolate incoming plants for about 7 to 10 days if you can. Even a laundry room or spare corner with bright light is enough for a short quarantine. That one simple habit has saved my other houseplants more than once.

4. Prune them back hard enough to reduce stress

Geraniums overwinter better when they are cut back. It can feel a little harsh the first time you do it, especially after they’ve been so lush all summer, but trimming them down reduces moisture loss, removes weak growth, and makes the plant easier to manage indoors.

For potted geraniums I plan to keep actively growing, I usually cut stems back by one-third to one-half. If a plant is 18 inches tall, I bring it down to about 8 to 12 inches. For dormant storage, I prune more firmly, often to 4 to 6 inches above the soil line, while making sure each stem still has a few healthy nodes.

Use clean scissors or bypass pruners wiped with rubbing alcohol first. Remove any leggy, soft, or crossing stems. Dead flowers and seed heads should come off too. The result should be a tidy, open plant with room for air circulation. It won’t look glamorous in October, but it sets the stage for stronger branching later.

5. Dig garden-grown geraniums carefully and trim the roots

If your geraniums spent summer planted directly in the flower bed, lift them with a hand spade or garden fork before the soil gets chilled. Start digging about 4 to 6 inches away from the main stem so you don’t slice off all the roots at once. Work your way around the plant, then lift gently.

Shake or brush off loose garden soil. If the root ball is especially large, trim it back so it fits into a pot that is only 1 to 2 inches wider than the roots. Geraniums don’t need a huge container to spend the winter, and oversized pots tend to stay wet too long indoors.

I repot mine into 6- to 8-inch pots for average plants and 10-inch pots only for very mature specimens. Terra-cotta dries faster, while plastic holds moisture longer. Either can work, as long as the pot has a drainage hole. I’d rather use a slightly snug pot than one that invites root rot.

6. Refresh the potting mix instead of bringing garden soil indoors

This is one of those small jobs that makes a big difference. Don’t bring heavy garden soil inside if you can avoid it. It compacts in pots, drains poorly, and may contain insects, weed seeds, or disease spores. Use a fresh, lightweight potting mix designed for containers.

I like a mix that drains well but still holds some moisture. If the bagged mix feels too dense, I add 1 part perlite to 3 parts potting mix. For example, I’ll combine 3 quarts of mix with 1 quart of perlite for a few medium pots. Geraniums like good drainage, and they really resent sitting in soggy roots through winter.

When repotting, set the crown at the same depth it was growing before. Press the mix in gently, not hard-packed. Then water thoroughly until excess drains from the bottom. After that first watering, let the top 1 inch of soil dry before watering again.

7. Give indoor geraniums the brightest light you can manage

Light is what separates sturdy overwintered geraniums from pale, stretched, cranky ones. If you want them to continue growing through winter, place them in your sunniest window, ideally one that faces south. Six hours of direct sun is a good minimum, and more is even better during the short days of late fall and winter.

If your home doesn’t get that much natural light, a simple grow light setup works beautifully. A fluorescent or LED grow light placed 6 to 12 inches above the foliage for 12 to 14 hours a day is usually enough. I’ve used a basic timer, and that takes one more thing off my mind during busy weeks.

Turn pots a quarter turn every few days so they grow evenly. If stems start reaching hard toward the window, that’s your cue they need more light. Better light over winter usually means more compact plants and heavier blooming once warm weather returns.

8. Keep them cool, not hot and drafty

Geraniums do best in a cool indoor environment, not a tropical one. For actively growing plants, daytime temperatures around 60°F to 70°F and nighttime temperatures around 50°F to 60°F are ideal. If they’re pressed right up against a heat vent or radiator, they often become dry, leggy, and more susceptible to spider mites.

At my house, I keep them in a bright room that stays cooler than the kitchen. A spare bedroom, enclosed porch, or cool mudroom often works better than the warmest room in the house. Just avoid cold drafts from frequently opened doors and avoid letting leaves touch icy window glass.

For semi-dormant storage, aim for 45°F to 55°F with some light and very modest watering. Too warm, and they’ll try to grow weakly. Too cold, and they may collapse.

9. Water less than you think you should

This is probably the step that trips people up most often. Geraniums need much less water in October and winter than they do in July. Indoors, growth slows down, light levels drop, and wet roots stay wet longer. Overwatering is the quickest route to yellow leaves, mushy stems, and root rot.

I always check the soil with my finger before watering. If the top 1 inch is dry, I water thoroughly and let the extra drain away. If the surface still feels cool and moist, I wait another day or two. In winter, that may mean watering every 7 to 14 days depending on pot size, room temperature, and humidity.

For semi-dormant plants stored cool, water even less. Just enough to keep stems from shriveling completely. For bare-root stored plants, moisture is lighter still; they shouldn’t be wet, but they also shouldn’t become crisp and hollow. Think “barely maintained,” not “regularly watered.”

10. Stop heavy feeding in October

Once you’re bringing geraniums in for winter, it’s time to back off the fertilizer. Feeding heavily in October encourages tender new growth right when the plant should be slowing down or settling into indoor conditions. That fresh, soft growth is weaker and more pest-prone.

I stop regular fertilizing in early to mid-October. If a geranium will stay actively growing indoors under strong light, I may give it a very diluted balanced fertilizer, about quarter-strength, once every 4 to 6 weeks during winter. But most of the time, less is better until late winter.

Then, around late February or March, I start feeding more regularly again, usually every 2 to 3 weeks with a bloom-supporting fertilizer according to the label. That timing supports fresh spring growth instead of forcing awkward winter growth.

11. Try the bare-root storage method if you’re short on windowsill space

If you don’t have enough bright indoor space, bare-root storage is worth trying. It sounds strange, but it has been used for generations and can work very well with healthy geraniums. After digging the plants, shake off the soil, trim back the top growth, and let the roots and stems dry for a day in a sheltered spot.

Then place each plant in a paper bag or hang it upside down in a cool, dark, dry area around 45°F to 50°F. A basement or unheated closet can work if it stays above freezing. Check them about once a month. If stems become very shriveled, soak roots in lukewarm water for 1 to 2 hours, then return them to storage.

In late winter, usually around March, pot them up in fresh mix, water them in, and place them in bright light. Not every plant will make it, but it’s a handy way to save several geraniums without turning your house into a greenhouse.

12. Take cuttings as a backup plan

This may be my favorite “insurance policy” step. Even if the mother plant struggles over winter, cuttings give you a second chance. In October, I snip healthy, non-flowering stems 3 to 4 inches long, remove the lower leaves, and let the cut end dry for a couple of hours.

Then I place the cuttings into a small pot filled with moist potting mix or a mix of half potting soil and half perlite. I bury one or two nodes, firm the soil gently, and place the pot in bright indirect light. Roots usually form in about 3 to 4 weeks at room temperatures around 65°F to 75°F.

For families with kids, this is a fun little gardening project too. My own crew always liked checking for “baby roots.” And for picky gardeners who hate risk, this is the easiest way to save a favorite variety without babying the whole mature plant all winter.

13. Pinch and shape in late winter for bushier plants

If your geraniums make it through winter, don’t just set them outside in spring and hope for the best. To get the bigger blooms and fuller shape the headline promises, you need to encourage branching. Once new growth starts in late winter or very early spring, pinch back stem tips just above a leaf node.

This simple step tells the plant to branch instead of growing one long stem with a bloom at the top. I usually pinch when stems have put on 2 to 3 inches of fresh growth. You don’t want to keep pinching too late into spring, though, or you’ll delay flowering. One good shaping session in late February or March is often enough.

A compact, many-branched geranium produces more bloom clusters than a lanky plant with only a few stems. It’s one of those little chores that pays off all summer long.

14. Harden them off slowly in spring

When the weather warms again, don’t rush them straight from the house to full sun on the porch. Indoor-grown leaves are tender, and one bright windy afternoon can scorch them. Wait until nighttime temperatures are consistently above about 50°F before moving them out for good.

Start by placing them outside in bright shade or morning sun for 2 to 3 hours a day. Increase outdoor time gradually over 7 to 10 days. After that, move them into their summer pots or beds and resume normal watering and feeding. This gradual transition helps prevent shock, leaf burn, and growth stalls.

I know it’s tempting to skip this when the first warm weekend arrives, especially after a long winter. But easing them back outside really does lead to sturdier plants and quicker blooming.

15. Choose only your healthiest plants to save for the biggest blooms next year

If you have a lot of geraniums, don’t feel like you must save every single one. The best blooms next summer usually come from the strongest, healthiest stock. Choose plants with thick stems, rich green leaves, good branching, and a solid blooming history. Skip weak, diseased, heavily stressed, or chronically leggy plants.

I usually ask myself three questions: Did this plant bloom well all summer? Does it have sturdy stems? Is it free from pests and rot? If the answer is yes, it earns a place indoors. If not, I compost it and make room for healthier plants. That may sound practical to a fault, but it saves time, space, and disappointment later.

October geranium care is really about setting up next year’s success before winter ever begins. A little pruning, cleaning, repotting, and thoughtful storage now can mean fuller plants, stronger roots, and armfuls of blooms by early summer. And on a gray February morning, having a sturdy green geranium on the windowsill is a sweet reminder that spring is still coming.