Rugosas and Canadian Explorer roses are the safest bets for a Vermont yard, and they come through winter with little help. Shrub roses like Knock Out and the climber New Dawn do well in the milder valleys. Hybrid teas, grandifloras, many English-style roses and tree roses are the ones that fail, and garden centers stock all of them every spring. What follows sorts the shelf by what lives, what dies back and what to check before paying.
Which roses survive a Vermont winter
Vermont spans USDA hardiness zone 4a to 6a on the 2023 USDA Plant Hardiness Zone Map. That system rests on a single number, the average annual extreme minimum temperature, so it tells you how cold the worst night usually gets and nothing about snow cover, wind or summer heat. Burlington, on Lake Champlain, is one of the milder corners of the state. The Green Mountains and the Northeast Kingdom run colder, and a rose rated for zone 5 that thrives in a Burlington yard can die in a hill town like Stowe or Craftsbury.
Which types of roses are hardy in zone 3 and 4?
Rugosas lead the list. Most hybrids of Rosa rugosa are rated for zone 3 and colder, tolerate the road salt that flies off Vermont highways, and push new canes from the base even after a bad winter. The Explorer series, bred in Canada for prairie and Quebec winters, is the second group. Most of its climbers and shrubs are rated for zone 3, which covers every corner of the state. The Parkland series from Manitoba works the same way. Species roses and a handful of old shrub roses also hold up, but the three groups above are the ones to look for first.
Where do hybrid teas fall short in Vermont?
Hybrid teas are usually rated for zone 5 at best, with many tags saying zone 6. At the warm edge of the state they live only if the graft union is buried each fall. In zone 4 and colder, the canes die to the ground in most winters, and what grows back may not be the rose you bought. The season is short, too. At Burlington, NOAA NCEI climate normals put the last spring freeze between April 30 and May 10 and the first fall freeze between October 3 and October 13, and the hills get less. A rose that has to rebuild its canes every year has little time left to bloom.
Named roses that hold up here
A short list of named roses covers most Vermont yards. The ones below are sold by mail-order nurseries and many local garden centers, and each has a track record in cold climates.
Which rugosa and Explorer roses can you count on?
Hansa is one of the toughest of the group. It is a double, magenta-purple, clove-scented rugosa rated for zone 3 and colder, and it throws a thicket of canes followed by large red hips. Therese Bugnet is a hybrid rugosa with soft pink double flowers on reddish canes. It grows tall, is rated for zone 3 or colder, and handles a Northeast Kingdom winter without trouble. Blanc Double de Coubert is the white, fragrant option in the same hardiness class.
From the Explorer series, William Baffin and John Cabot are climbers that tolerate zone 3 winters, though they behave more like big, arching shrubs than clingy vines. Henry Hudson is a compact white-pink shrub of the same type. Champlain, a red shrub named for the explorer the lake carries, is another Explorer that is dependable in the cold.
How do New Dawn and Knock Out do in colder zones?
Both are borderline in the hills and reliable in the valleys. New Dawn is a pale pink, repeat-blooming climber rated for zone 5. In zone 4 its canes often die back, and it blooms less after a hard winter. It does best in the Champlain Valley and in sheltered spots, so plant it against a south or west wall if you want it to climb at all. Knock Out is also usually rated for zone 5. It blooms on new wood, so even a plant frozen back to the snow line flowers the same summer. In zone 4 and colder, expect a shorter shrub each spring, since it keeps rebuilding from lower down.
Sold here, but not for this zone
National nurseries ship the same stock to Vermont that they ship to Virginia, and the tags are written for the national market. A tag reading “zones 5 to 9” is accurate. In Vermont it means the plant is at its limit in the milder valleys and past it almost everywhere else. Anything rated for zone 6 or warmer will not come through a Vermont winter outdoors without serious help.
Which roses on the shelf need winter protection in Vermont?
Several types show up every spring in full leaf and bloom, and many of them are lost in a Vermont winter:
- Hybrid teas, the long-stemmed florist type, including familiar names like Peace and Mister Lincoln.
- Floribundas and grandifloras, which are bred from hybrid teas and share their weakness.
- Many English-style roses, whose tags often say zone 5 or 6 and run optimistic for colder pockets.
- Tree roses, which are a bush grafted onto a bare trunk.
- Potted miniature roses and florist gift roses, which are grown for greenhouses and indoor use.
Plants sold in bloom at big-box stores often come from growers in milder states, and they have not been conditioned for a Vermont fall. If you buy a zone 5 rose anyway, treat it as a project. After the ground starts to freeze, mound soil over the graft union, the knob near the base where the named rose joins the rootstock. Left bare, that joint is vulnerable to cold, and if it dies the named rose is lost and only rootstock shoots may remain.
Tree roses are the hardest case, because the graft sits at the top of an exposed trunk. In most of Vermont the choices are to tip the plant over and bury it, or to move it into an unheated garage or cellar for winter. Most gardeners find that more work than the rose repays.
What to check on the label before buying
Three things on a tag or at the nursery tell you most of what you need: the grade, whether the rose is grown on its own roots or grafted, and the zone rating.
Grade applies to bare-root roses. No. 1 is the top grade, with more and thicker canes, and Nos. 1½ and 2 are smaller plants. Where a hard winter kills some canes, a No. 1 plant has more wood to spare. Potted roses often carry no grade, so judge them by the number of sturdy, green canes and a firm root ball.
Why does own-root matter more the colder it gets?
A grafted rose is a named variety joined to a different rootstock, usually chosen for vigor and not for cold tolerance. Dr. Huey is a common choice. If winter kills the top and the graft union with it, any shoots that emerge come from the rootstock, and they carry the rootstock’s flowers, which are often different from the named rose and usually bloom once. An own-root rose has no graft. If it freezes to the ground, the canes that grow back are still the rose you bought. Every winter in zone 4 or colder is a gamble for a grafted plant, so look for the words “own-root” on the tag or in the catalog listing. Own-root roses start smaller and grow slower in the first season, and the payoff comes the first time a hard winter hits.
Last, compare the tag’s zone with your own yard, not with Burlington. A rating one zone warmer than your site means protection every year.
Checking this against your own county
The frost dates above are for Burlington, one of the milder reference points in the state, and a yard 30 miles away in the hills can run weeks shorter. University of Vermont Extension has regional offices and a Master Gardener program that answer exactly these questions. Ask them for your own town’s zone and its typical first fall frost, then match roses to that number instead of to a state average. For siting, pruning and feeding once you have chosen, see the rundown on growing roses in Vermont.
Common questions
Is Knock Out rose hardy in Vermont?
It is usually rated for zone 5, so it is reliable in the milder valleys and uncertain in the hills. In colder spots it can freeze back to the snow line or the ground. It blooms on new growth, so it often recovers the same summer, but it stays smaller than the plant on the tag.
Can you grow hybrid tea roses in Vermont?
Yes, with work. At the warmer end of the state, burying the graft union each fall keeps many plants alive. In zone 4 and colder, expect the canes to die back most winters and many plants to be lost, and consider rugosas or Explorers instead if you want roses without annual chores.
Do rugosa roses need winter protection?
Established plants of Hansa, Therese Bugnet and Blanc Double de Coubert do not. A first-year plant is small, and a layer of mulch over its base costs little.
Why did my rose come back with different flowers?
The top of a grafted rose likely died, and the rootstock sent up its own shoots. Look for a knob at the base and for canes that emerge below it. Replacing the plant with an own-root rose avoids the problem.