Garlic is the one crop you plant in Missoula as everything else is dying, and it might be the most forgiving thing you can grow here. Planting garlic in the fall, letting it sit under the snow, and pulling fat bulbs in July fits Montana’s climate so well that MSU Extension calls it very adaptable to our cold winters and short season. If you have never grown it, this is the easiest yes in the garden. If you have, aim for about four to six weeks before the ground freezes, which in Missoula usually means sometime in October, depending on the year and your site.
Why Garlic Goes in Now, Not Spring
Garlic needs a stretch of cold, several weeks below 40 degrees, to trigger the clove to divide into a full bulb. The technical word is vernalization, and a Montana winter provides it for free. Per the MSU Extension MontGuide on growing garlic, the traditional timing in Montana is fall planting four to six weeks before the ground freezes, typically meaning mid October, and often workable as late as November. The cloves put down roots before winter, sit tight under the snow, and explode out of the ground in April, weeks before you could even work the soil for a spring planting.
Spring-planted garlic can grow here, but it usually makes smaller bulbs, since it misses most of that cold spell and the fall head start on roots. Fall planting is where most of the yield comes from.
Hardneck Is a Strong Montana Choice
Garlic comes in two types, and hardneck is the usual pick here. Hardneck garlic is the most winter hardy, produces those big easy-peel cloves, and throws a curling flower stalk called a scape in June that is a bonus harvest all its own. Snap the scapes off when they curl into a loop and cook them like scallions, which also pushes the plant’s energy back into the bulb. MSU lists cultivars like Spanish Roja, German Red, and Montana Giant, a Rocambole type, along with the cold-hardy Chesnok Red.
Softneck garlic, the braidable kind from grocery stores, typically stores longer, 10 to 12 months by MSU’s figures against a hardneck’s shorter shelf life, but it is slightly less winter hardy and happier in mild-winter climates. If you want to try one, MSU suggests Italian Late and Inchelium Red. But if you are planting only one type in Missoula, hardneck is the safer bet.
One sourcing note: plant seed garlic from a garden center, a farmers market grower, or a seed company, not grocery store garlic, which may be treated to prevent sprouting and may carry soil diseases from wherever it was grown.
Ordering seed garlic online: Botanical Interests, the seed company we use ourselves, also sells certified organic seed garlic, including Chesnok Red and Inchelium Red, two of the cultivars MSU names above. True Leaf Market sells German Red, another hardneck on MSU’s list. Garlic availability changes through the fall, so check the listing and its shipping timing against your planting window. These are affiliate links, so if you buy through them, Garden City Plant Care may earn a commission at no extra cost to you.
Planting: Two Inches Deep, Pointy End Up
Pick a spot in full sun with loose, well-drained soil, and skip anywhere that grew garlic or onions in the last three years, since most of the major garlic diseases are soil-borne and rotation is a key defense. Top-dress the bed with about an inch of compost, or work it into the top few inches the way MSU describes. Left on top, it gets carried down by the soil life over winter.
Break your bulbs into cloves the day you plant, keeping the papery wrapper on each clove intact, and plant the biggest cloves. Big cloves grow big bulbs, and the small inner cloves can go to the kitchen. Per MSU: root end down, pointed end up, about two inches deep, four to six inches apart, in rows about a foot apart. Ten feet of row takes roughly half a pound of seed garlic and gives back four to seven pounds, which is somewhere between 40 and 60 bulbs. For most households, ten to twenty feet of row is a year of garlic.
Mulch It and Walk Away
Cover the bed with four to six inches of clean straw or shredded leaves. The mulch insulates the cloves against our freeze-thaw cycles, which can literally heave unmulched cloves out of the ground, and it holds moisture into next summer. MSU notes you can skip mulch if you can count on steady snow cover all winter, but Missoula winters often lack steady snow cover, so mulch is the safer bet. Use weed-seed-free straw, never plastic sheeting, which does nothing for the soil and everything for your frustration.
That mulch matters again in spring, because garlic hates weeds. Its roots are shallow, and MSU’s numbers say weed competition can shrink your bulbs by up to 30 percent. A thick mulch does most of that weeding for you.
A note on quantity, because first-time garlic growers reliably underplant. Garlic is not like zucchini, where two plants overwhelm a household. Every clove is one bulb, once, and a family that cooks with garlic goes through more of it than they think. Twenty feet of row is not extravagant, and the surplus is the least burdensome extra harvest in gardening: it stores for months, gives well as gifts, and next fall the biggest bulbs become your seed stock, which is how you stop buying seed garlic entirely. Since garlic grows from cloves, saved bulbs are copies of what you planted, but replanting your own biggest, healthiest bulbs keeps your stock coming from plants that already did well in your bed.
If snow comes before you plant, do not give up on the year. As long as you can get a fork into the ground, the cloves can go in, and MSU’s window running into November is genuinely forgiving. Later plantings root less before winter and may size slightly smaller, but a November clove under good mulch usually still beats waiting for spring.
What Happens Next
Green shoots may even poke up before snow flies. That is fine, leave them. In spring, feed the bed with compost or an organic granular fertilizer when the tops are about six inches tall, and give it about an inch of water a week through spring and early summer. When the lower leaves start browning and the tops begin to fall over in July, stop watering, let the soil dry, and get ready to dig the payoff. Curing and storing is its own small ritual. MSU suggests drying the bulbs in a shady, airy spot for four to six weeks, then storing them at 45 to 55 degrees, not in the refrigerator.
Fall garlic is the kind of move that makes a garden feel like it runs year round instead of ninety days a year. For the rest of the year’s timing, shoulder seasons and all, the Missoula Planting Calendar lays out what goes in when.
Sources
- Montana State University Extension, Growing Garlic in Montana