When to Plant Tulip Bulbs: Soil Temperature, Regional Timing and Dates by City

Plant tulips in fall, after the soil at bulb depth has cooled below 60°F (16°C) and while there are still at least two weeks of rooting weather left before the ground freezes. The soil thermometer sets the start; the calendar only tells you when to begin checking. In practice that is mid-September to mid-October in Minnesota, September and October in Colorado, October in Maryland, and October through late December in Georgia.

Where winters are too mild to chill a bulb properly, from Dallas and Houston to Sacramento and Florida, the sequence changes. The bulbs spend 6 to 16 weeks in a refrigerator first, then go into the ground anywhere from late October around Sacramento to early January on the Gulf Coast.

Tulip planting dates by city

In Zones 3 to 7, each window in the Plant bulbs column opens five weeks before the city's median first fall frost and closes on that date. In Minneapolis, that lines up with Minnesota's mid-September to mid-October planting season. Fargo, Denver and Salt Lake City follow their regional months instead, and the Zone 8 and 9 cities follow their regional calendars. Start checking soil temperature when a window opens. The second column applies only where winter cannot chill the bulbs on its own.

Frost dates are the 50% probability dates for a 32°F (0°C) freeze in NOAA 1991–2020 climate normals, measured at each city's main airport station (Central Park for New York); zones are from the 2023 USDA map at those stations. In half of years the last frost falls later than the date shown.

For a town not listed in Zones 3 to 7, look up your median first fall frost date and count back five weeks to find when to start checking the soil. Plant once soil 6 to 8 inches (15 to 20 cm) down reads below 60°F (16°C), and aim to finish by the frost date. In the high, dry West and in Zone 8 and warmer, follow the regional months below.

Why tulips wait for cool soil

Tulips need a long spell of cold to flower, and they need roots in place before that cold arrives. Most spring bulbs need 12 to 16 weeks of cold. In Texas and around Sacramento, 6 to 10 weeks in the refrigerator, followed by cool winter soil, is enough for one season of tulips. That is why the bulbs go in during fall, and why winter itself does the chilling across most of the country.

Roots are the reason for the deadline. A bulb planted into cool, workable soil spends the last weeks of fall growing roots, and it has to finish that before the soil freezes. Allow at least two weeks between planting and freeze-up.

The temperature limit works as a ceiling, not a floor. Plant once soil at bulb depth stays below 60°F (16°C). In northern gardens, 50 to 55°F (10 to 13°C) is the sweet spot, as long as the soil is not frozen. A single cold morning does not count. Check a soil thermometer at bulb depth for several days running before you dig, because a warm spell can push the reading back up.

Heat, not cold, is what tulips handle poorly. They lose vigor once soil reaches 70°F (21°C) and do best where winters are cool and moist and summers warm and dry. As dormant bulbs they are hardy in USDA Zones 3 through 8, which is why they return for years in Minnesota or Utah and fade fast along the Gulf. You can check your hardiness zone by ZIP code.

When to plant tulips by region

Regional months follow the same logic: the colder the fall, the earlier the window opens, and the warmer the winter, the more the refrigerator has to do.

Planting months for fall-planted tulips by region; pre-chilled bulbs go in only after their full time in the refrigerator.

West of the Cascades, cold is never short but drainage is. Winter rain that pools around a bulb rots it, so raised beds or berms matter more there than the exact week.

Around Sacramento and the Sierra foothills, winters rarely give 6 to 10 straight weeks at 40°F (4°C) or below, and the bulbs also need a dry summer dormancy. Plant them where they stay dry in summer, or lift them after the foliage dies.

Pre-chilling tulips in warm-winter gardens

If your winter cannot supply the cold, a refrigerator can. Chill bulbs in Texas, along the Gulf Coast, in central and coastal South Carolina, in Florida and around Sacramento. Skip it farther north, in the Piedmont from Raleigh to Atlanta, and west of the Cascades.

Chilling times differ by region: 6 to 10 weeks in Texas and around Sacramento, 12 to 16 weeks in central and coastal South Carolina and the mildest parts of Georgia, and two to four months in Florida. Hold the bulbs near 40°F (4°C) in ventilated paper or mesh bags in a crisper or the bottom of the refrigerator, and check the label first, since some bulbs are sold already pre-cooled.

Count the weeks back from your planting date. For a December 10 planting with 10 weeks of chill, the bulbs go into the refrigerator on October 1. In Texas, they come out and go straight into the ground in early to mid-December, after nights have stayed below 50°F (10°C) for several weeks.

Pre-chilled tulips in the South give one season of flowers and seldom bloom again. Plan on fresh bulbs each fall rather than expecting them to return.

How to plant tulip bulbs

Plant into a sunny, well-drained bed, at about three times the bulb's height, in groups rather than rows.

How deep and how far apart to plant tulip bulbs

Set tulip bulbs with their base 6 to 8 inches (15 to 20 cm) below the soil surface, about three times the bulb's own height, and 4 to 6 inches (10 to 15 cm) apart. Measure to the bottom of the bulb, not its tip; the largest bulbs go to the full 8 inches (20 cm).

Adjust for soil. In light, sandy soil, go 1 to 2 inches (2.5 to 5 cm) deeper; in heavy clay, set them 1 to 2 inches shallower. Deep planting also discourages the bulb from splitting into small offsets and keeps it flowering well for several years. Shallow planting invites frost heaving, which lifts bulbs to the surface during freeze-thaw cycles. Small species tulips sit shallower than the big hybrids.

Use the closer spacing for a dense block of color, and up to 8 inches (20 cm) for a looser drift. Plant in clusters of at least five to seven bulbs of one color, in odd numbers, rather than a single line along a path. For combinations with later bulbs and perennials, see designing with spring bulbs.

Step by step

Buy bulbs in August or September for the best choice, and pick firm ones with intact papery skins and no soft or moldy patches. Keep them dry, dark and cool, around 60 to 65°F (16 to 18°C), until planting day.

1. Check the soil temperature. Push a soil thermometer 6 to 8 inches (15 to 20 cm) down and plant once it stays below 60°F (16°C) from day to day, before the ground freezes.
2. Choose a sunny, well-drained spot. Pick full sun and soil where water never stands in winter. Avoid beds hard against south- or west-facing walls, where tulips emerge early and frost catches the buds. Use raised beds or berms in wet-winter areas.
3. Dig to depth and set the bulbs. Dig the whole bed or each hole to the depth for your bulb size and soil, work in compost, and set each bulb pointed end up. Where squirrels or voles dig, line the hole with a wire cage first.
4. Backfill halfway, soak, then finish. Cover the bulbs with half the soil, water to settle it, then fill the rest. Skip fresh manure, high-nitrogen fertilizer and bone meal.
5. Leave the bed alone until it freezes. Do not keep watering a bed that is already moist. Wet soil, not cold, is what rots bulbs over winter.
6. Mulch once the ground is frozen. Spread 2 to 3 inches (5 to 8 cm) of shredded leaves, wood mulch or clean straw to stop freeze-thaw cycles from heaving the bulbs, and pull it back in spring as the soil warms.

Tulip types that come back, and those that don't

The planting window barely shifts between tulip types. What changes is the bloom date and whether the bulb returns. Tulips flower from early to late spring depending on class, so mixing early, midseason and late classes stretches the show from a single fall planting.

Tulip groups by how long they persist; any of them can be planted in the same fall window.

Darwin hybrid tulips such as Apeldoorn, Golden Apeldoorn, Pink Impression, Parade, Olympic Flame and Daydream are the large-flowered tulips most likely to come back. For cold-winter gardens, Couleur Cardinal, Don Quichotte, Orange Emperor, Purissima, Toronto and Showwinner have a track record of flowering for several years.

Species tulips live longest of all. Tulipa tarda, Tulipa linifolia, Tulipa greigii and Tulipa kaufmanniana persist in northern beds where hybrids give out. In the South, lady tulip (Tulipa clusiana), Tulipa saxatilis (including the Bakeri Group selection 'Lilac Wonder') and Tulipa eichleri can naturalize, and a few warm-climate species need little or no winter chill at all.

The showiest late tulips, such as Queen of Night, Menton and the lily-flowered West Point, flower best in their first spring and decline sharply from their second. Treat them as bedding and replant every fall, especially on wet clay. Do not count on any tulip being deer resistant.

Planting too early, too late, or not at all

Early planting gains nothing, and late planting costs less than leaving bulbs in the bag. Soil still above 60°F (16°C) is too warm, so an early September planting in a mild fall simply sits in warm ground.

Late planting is more forgiving in tulips than in most bulbs. They can go in as late as you can still work the soil. The exception is Colorado and similar high, dry country, where bulbs planted after October may not root in time, can flower unevenly and may heave out of the ground during freeze-thaw swings. If you are late, plant at full depth and mulch promptly after freeze-up.

Bulbs bought at end-of-season sales should still be firm. Store them cool, dry and away from fruit, and plant them at the next stretch of workable weather.

If the ground freezes before you get to them, pot them instead. Use containers at least 8 inches (20 cm) deep with drainage holes and a soilless mix, and keep the pots in the dark at 35 to 50°F (2 to 10°C). After 14 to 15 weeks, bring them into warmth, and they will flower in late winter or early spring.

Spring planting is the last resort. Bulbs that spent winter in the bag have missed their chill, so set them out as soon as the ground thaws, expect weak bloom or none that season, and discard any that have gone soft.

Protecting tulip bulbs from squirrels, voles and deer

Buried wire is the most dependable protection. Tulips are among the first bulbs animals find: squirrels and chipmunks dig up new plantings, mice and voles eat bulbs underground, and deer bite off the flowers while leaving the leaves.

For bulbs, bury a cage of 1/2-inch (13 mm) galvanized hardware cloth at planting depth and set the bulbs inside it. For a whole bed, lay chicken wire flat over the soil after planting, pin or weight the edges, and hide it under mulch. Repellents work only while fresh and need reapplying often, especially after rain.

Leave bone meal out of the planting hole. It attracts rodents, which then dig up the bulbs, and most garden soils already hold enough phosphorus; add it only if a soil test shows a shortage.

Where animal pressure is heavy, mix in bulbs they leave alone. Daffodils are poisonous to squirrels, and grape hyacinth, snowdrops, Siberian squill and ornamental alliums are seldom touched. Daffodils share the same fall planting season; see when to plant daffodil bulbs.

After planting: late frost, watering and fading flowers

In spring, light to moderate frost seldom harms tulips that are already up and budding. If a hard frost is forecast, rake the winter mulch back over emerging shoots for the night.

Water through dry spells while the leaves are green, including after bloom. Snap off each faded flower, then leave the leaves until they yellow and wither, at least six weeks, because they rebuild the bulb for next year. Feed lightly as flowers fade only if you are keeping the bulbs as perennials, and avoid high-nitrogen fertilizer.

Plantings kept as perennials do best with lifting and dividing every three to four years, done in midsummer after the foliage has died back. For care through the rest of the year, see the tulip growing guide, and sketch where next fall's drifts will go in Sow's design studio.