Garden Bed Math

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Planting tulips and daffodils in zones 3 to 5: one bed plan, from frost date to frozen ground

Quick answer

In zones 3 to 5, Minnesota Extension says to plant spring bulbs from mid-September to mid-October. Your first fall frost falls inside that window, so you're planting around it. Tulips can wait: Minnesota says they can go in as long as you can still get them into the soil. At Iowa State's 6 inches apart, a 4 x 8 ft bed holds 128 tulips or daffodils, set 6 to 8 inches deep. Water the bed, keep watering weekly if the fall is dry, and cover it with 2 to 3 inches of mulch.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026; Iowa State Extension, How deep should I plant tulips?, checked October 8, 2026; Nebraska Extension, G1742 Spring Flowering Bulbs, checked October 9, 2026; NOAA 1991-2020 U.S. Climate Normals, annual/seasonal, checked October 7, 2026.

Updated October 9, 2026 Sources checked October 9, 2026 Print the working copy

A bed dug 8 inches deep with tulip and daffodil bulbs in the bottom, yellow birches behind and a bulb planter

Decide first

Should you plant spring bulbs this fall?

Do it yourself

Plant them yourself

A sunny bed and one or two afternoons between mid-September and mid-October will do it. Order in August or September, since Minnesota says to plant hardy bulbs as soon as you can after you buy them.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

Skip it

Skip bulbs that aren't hardy where you live

Minnesota names bulbs that aren't hardy for the region as one reason for poor flowering. Check the zone on the tag before you buy.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

Get help

Ask your county extension office

For varieties that come back year after year in your county, or leaves that look wrong in spring, call your county Cooperative Extension office. This page covers dates, counts and the bed layout, not plant problems.

A filled-in bulb planting map for zip code 55108 BULB PLANTING MAPUSDA zone 5a StationU of MN St Paul, 0.6 mi, NOAA 1991 to 2020 FIRST FALL FROST 1 in 10 earlierSep 25 TypicalOct 8 PlantSep 15 to Oct 15 THE BED Inside size4 x 8 ft Spacing6 in each way Depth6 to 8 in THE ORDER Large bulbs128 Rows8 of 16 Mulch5.3 to 8.0 cu ft Daffodils and small bulbs first. Tulips last: they can go in while you can still dig. Water well, water weekly if it stays dry, 2 to 3 in of mulch. Spring: write down the first bloom. The same plan from September to December SepOctNovDec ? Early Seplook up frost, order Sep 15window opens Sep 251 in 10 first frost Oct 8typical first frost Oct 15window closes tulips: until the ground freezes no source gives a freeze date for a zip code
A filled-in bulb planting map for zip code 55108 in St. Paul: NOAA 1991 to 2020 frost dates, the bed and the order, then the plan from September to December. The tulip line has no end date because no source gives a ground-freeze date for a zip code.

Late August to order, mid-September to mid-October to plant, tulips last

The steps, in order

  1. Look up your first fall frost

    Type your zip code into the frost date lookup and write down two dates: the 1 in 10 earlier first fall frost and the typical one. For zip code 55108 in St. Paul, that's September 25 and October 8.

    Have ready: Your zip code. Do it in late August, before you order.

    Frost date lookup by zip code

    Source: NOAA 1991-2020 U.S. Climate Normals, annual/seasonal, checked October 7, 2026.

  2. Split the window: daffodils first, tulips last

    Minnesota plants from mid-September to mid-October. Put the daffodils and small bulbs in first. Save the tulips for the end, because Minnesota says they can go in as late as you can still dig. If your typical frost comes in September, start near the beginning of the window. That last part is our rule of thumb.

    Have ready: The two frost dates from step 1 and a calendar.

    Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026; NOAA 1991-2020 U.S. Climate Normals, annual/seasonal, checked October 7, 2026.

  3. Measure the bed and count the bulbs

    Measure inside the boards and type the size into the bulb calculator. At Iowa State's 6 inches for tulips and daffodils, a 4 x 8 ft bed takes 8 rows of 16: 128 bulbs.

    Have ready: A tape measure.

    Garlic and bulb planting calculator

    Source: Iowa State Extension, How deep should I plant tulips?, checked October 8, 2026.

  4. Order early, keep the bulbs cool

    Minnesota says to buy hardy bulbs in August to September and plant them as soon as you can. Until then, Nebraska Extension keeps them at 60 to 65°F, cool enough to save the bulbs' energy until planting.

    Have ready: A cool basement shelf, away from the furnace.

    Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026; Nebraska Extension, G1742 Spring Flowering Bulbs, checked October 9, 2026.

  5. Dig 6 to 8 inch holes on a dry day

    Iowa State plants tulips and daffodils 6 to 8 inches deep and crocuses 3 to 4. Minnesota's rule is 2 to 3 times the bulb's width: go 1 or 2 inches deeper in sandy soil and an inch or two shallower in clay. Nebraska's test for whether it's too wet: if the soil crumbles between your fingers, you can dig.

    Have ready: A trowel or bulb planter marked at 4, 6 and 8 inches.

    Source: Iowa State Extension, How deep should I plant tulips?, checked October 8, 2026; University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026; Nebraska Extension, G1742 Spring Flowering Bulbs, checked October 9, 2026.

  6. Half the soil, soak, the rest

    Set each bulb pointed side up. Minnesota covers it with half the soil, soaks the hole, then adds the rest.

    Have ready: A hose or a full watering can at the bed.

    Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

  7. Water weekly, then mulch

    Minnesota mulches 2 to 3 inches right after planting. Nebraska waters deeply once a week without rain until the ground freezes, then adds the 2 to 3 inches. Pick one order and write it down. On a 4 x 8 ft bed, 2 to 3 inches is 5.3 to 8 cubic feet of mulch.

    Have ready: Leaf mulch, wood mulch or seedless straw, piled by the bed.

    Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026; Nebraska Extension, G1742 Spring Flowering Bulbs, checked October 9, 2026.

  8. Label it, then log the bloom

    Minnesota says to label what you planted and where. Mark each group, then fill in the planting map or the log below. In spring, write down the first bloom date for each kind. Next fall, compare them with the year before.

    Have ready: Plant labels and the printed map.

    Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

Free, one page, black and white

Print the working copy

Bulb planting map: the steps above as a checklist with a date box for each, on one US Letter page.

Open the working copy

If a step gets skipped

What goes wrong

⚠️

Planting everything late

Minnesota lists planting too late in the season as one reason bulbs flower poorly the first year. Only tulips get the late slot. Daffodils and small bulbs go in during the window.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

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Planting too shallow

Shallow planting is another reason Minnesota gives for poor first-year flowers. Check the trowel mark on every hole, and go 1 or 2 inches deeper in sandy soil.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

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Letting a dry fall go unwatered

Nebraska waters deeply once a week without rain until the ground freezes. Minnesota says to soak the soil if fall is drier than normal. Minnesota plants in fall so the roots grow before the ground freezes.

Source: Nebraska Extension, G1742 Spring Flowering Bulbs, checked October 9, 2026; University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

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Mulching the small early bulbs

Illinois Extension says the small, early-blooming bulbs should not be mulched. Leave the crocus strip bare and mulch the tulips and daffodils.

Source: Illinois Extension, Planting Bulbs, checked October 9, 2026.

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Not writing down where they went

By March the bed looks empty, and it's easy to dig into the bulbs by mistake. Minnesota says to label what you planted and where.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

A planted bulb bed under 2 to 3 inches of shredded leaf mulch with a light dusting of snow on the lawn
Minnesota lists leaf mulch, wood mulch or seedless straw, 2 to 3 inches deep.
Cold-zone bulb planting wording vs the first fall frost (NOAA 1991 to 2020) Nearest NOAA station to each zip code; zone from the 2023 USDA zip listing Bemidji area, MN, zone 3bstation: Cass Lake tulips: while the soil can be dug typical Sep 261 in 10: Sep 12 Minnesota: "mid-September to mid-October"; we draw Sep 15 to Oct 15 Duluth, MN, zone 4bstation: Duluth NWS tulips: while the soil can be dug typical Oct 11 in 10: Sep 19 Minnesota: "mid-September to mid-October"; we draw Sep 15 to Oct 15 St. Paul, MN, zone 5astation: U of MN St Paul tulips: while the soil can be dug typical Oct 81 in 10: Sep 25 Minnesota: "mid-September to mid-October"; we draw Sep 15 to Oct 15 Norfolk, NE, zone 5bstation: Norfolk 4 W typical Oct 41 in 10: Sep 22 Nebraska: "late September through October"; we draw late September as Sep 21 Sep 1Sep 15Oct 1Oct 15Nov 1Nov 15Nov 30 extension planting wordingtypical first fall frost1 in 10 earlier date
Minnesota and Nebraska planting wording against the first fall frost at the NOAA station nearest a town in each state, 1991 to 2020 normals. The dashed line is Minnesota's later allowance for tulips.
Late-fall order for a bulb bed: the mulch goes on after the freeze Order from Nebraska Extension G1742; Illinois leaves small early bulbs unmulched 1. Plant and water Pointed end up, soil back, water thoroughly 2. Water if it is dry No rain? Water deeply once a week until the freeze 3. Ground freezes Top of the soil goes hard; digging is over for the year 4. Mulch 2 to 3 in 2 to 3 in Wood chips, shredded bark or pine needles Schematic, not to scale. Minnesota Extension mulches 2 to 3 in right after planting instead.
Nebraska Extension's order for a fall bulb bed: plant and water, water weekly if it stays dry, then mulch 2 to 3 inches once the ground has frozen. Minnesota Extension mulches right after planting instead.

When the steps change

Variants

🪴

Zone 3, frost in September

Near Bemidji, zip code 56601, the station at Cass Lake has a typical first frost of September 26 and a 1 in 10 date of September 12. Plant the daffodils in the second half of September and keep the tulips for October.

Source: NOAA 1991-2020 U.S. Climate Normals, annual/seasonal, checked October 7, 2026; PRISM 2023 USDA hardiness zone GIS datasets and zip-code listing, checked October 6, 2026; University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

🏙️

The plains: wait for cool soil

Nebraska Extension plants in late September through October, once the soil is below 60°F. It waters weekly until the ground freezes and mulches after that. In Norfolk, zip code 68701, zone 5b, the typical first frost is October 4.

Source: Nebraska Extension, G1742 Spring Flowering Bulbs, checked October 9, 2026; NOAA 1991-2020 U.S. Climate Normals, annual/seasonal, checked October 7, 2026; PRISM 2023 USDA hardiness zone GIS datasets and zip-code listing, checked October 6, 2026.

❄️

Small bulbs along the edge

Crocuses and grape hyacinths go 3 inches apart and 3 to 4 inches deep, Iowa State says. That's 16 per square foot. Choose small bulbs in the calculator to count an edge strip, and leave that strip unmulched, as Illinois says.

Source: Iowa State Extension, How deep should I plant tulips?, checked October 8, 2026; Illinois Extension, Planting Bulbs, checked October 9, 2026.

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A bed against a warm wall

Minnesota says soil near a foundation that faces south or west warms earlier in spring. Minnesota mulches those spots so the bulbs warm up gradually.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

What people learn the second year

Tips and tricks

  • Two planting days, not one. Plant the daffodils and small bulbs on one dry day in the window and the tulips on a second day near the end. That way each kind goes in at its own time.
  • Mark the depth on the tool. Wrap tape around the trowel or bulb planter at 4, 6 and 8 inches. By the third hole you won't need to think about it.
  • Do the crumble test first. Squeeze a handful of soil. Nebraska says that if it crumbles between your fingers, it's dry enough to dig and plant. (Nebraska Extension, G1742 Spring Flowering Bulbs)
  • Rake leaves into the mulch pile. Minnesota lists leaf mulch as one of the three covers. The leaves you rake in October can go straight onto the bulb bed. (University of Minnesota Extension, Planting bulbs, tubers and rhizomes)
  • Top up the mulch in spring. Nebraska adds mulch each spring after the first year to keep the layer at 2 to 3 inches. Put a reminder on the log. (Nebraska Extension, G1742 Spring Flowering Bulbs)

The one we checked the steps against

Primary source

Planting bulbs, tubers and rhizomes, University of Minnesota Extension. Checked October 9, 2026.

University of Minnesota Extension writes for a zone 3 to 5 state. Its page, reviewed in 2026, gives the mid-September to mid-October window, the tulip exception, the 2 to 3 times depth rule with the sandy and clay corrections, the planting and watering order, 2 to 3 inches of mulch and the reasons first-year bulbs flower poorly.

The arithmetic and the background reading

Tools and guides in this system

Common questions

Questions

When should I plant tulip bulbs in zone 4?

Minnesota Extension gives mid-September to mid-October for bulbs in cold climates, and says tulips can go in later, as long as you can still get them into the soil.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026.

When should I plant daffodils in zone 5?

In the window: mid-September to mid-October, Minnesota says. Nebraska says late September through October, once the soil is below 60°F.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026; Nebraska Extension, G1742 Spring Flowering Bulbs, checked October 9, 2026.

Is it too late to plant bulbs after the first frost?

No. In zones 3 to 5 the first frost usually falls inside the window. Illinois Extension says most bulbs can be planted until the ground is frozen.

Source: Illinois Extension, Planting Bulbs, checked October 9, 2026; NOAA 1991-2020 U.S. Climate Normals, annual/seasonal, checked October 7, 2026.

How many tulip bulbs go in a 4 x 8 raised bed?

At Iowa State's 6 inches apart, 128 bulbs in 8 rows of 16.

Source: Iowa State Extension, How deep should I plant tulips?, checked October 8, 2026.

How deep do I plant tulips in Minnesota?

Minnesota's rule is 2 to 3 times the bulb's width, 1 or 2 inches deeper in sandy soil and an inch or two shallower in clay. Iowa State gives 6 to 8 inches for tulips and daffodils.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026; Iowa State Extension, How deep should I plant tulips?, checked October 8, 2026.

Should I mulch bulbs right away or after the ground freezes?

Extension pages differ. Minnesota mulches 2 to 3 inches right after planting. Nebraska waters weekly until the ground freezes, then mulches 2 to 3 inches.

Source: University of Minnesota Extension, Planting bulbs, tubers and rhizomes, checked October 9, 2026; Nebraska Extension, G1742 Spring Flowering Bulbs, checked October 9, 2026.

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Sources

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