Herbs are one of the most satisfying things to grow in Missoula because most of them require very little from you once they are established. A few pots on a sunny step or a small dedicated bed can keep a kitchen supplied all summer.
That said, growing herbs in Missoula is not one-size-fits-all. Some are perennials that come back every year without any help. Some want the coolest part of the season and disappear in July heat. And a couple, basil especially, need you to treat them almost as carefully as tomatoes. Knowing which is which saves a lot of frustration.
Herbs That Come Back Every Year
These are the herbs worth planting once and leaving alone. They handle Missoula winters without much help and show up again in spring.
Chives are completely unfazed by Montana winters. They come up early in spring, produce all season, and multiply on their own. Plant them once and they are there indefinitely. The purple flowers are edible too, and they look nice in the garden.
Mint is almost too easy to grow in Missoula. It survives hard winters, spreads aggressively, and produces more than most households can use. The important thing to know: plant it in a container rather than directly in the ground. In the ground, it spreads into everything around it within a few seasons and becomes difficult to remove.
Oregano and thyme are both reliably perennial in Missoula. They go dormant in winter and come back strong in spring. Both do best in well-drained soil and a sunny spot. They are drought-tolerant once established and need very little attention.
Sage comes back year after year in Missoula as well. It gets woody over time, so cutting it back in spring keeps the plant productive. Good drainage matters for sage, especially through wet springs. If you are not sure what your soil is working with, the guide on Missoula soil types covers the clay and drainage challenges common across the valley.
Lavender can be perennial in Missoula with the right variety and good drainage. Hidcote and Munstead are the most cold-hardy options. They do not love wet feet, so raised beds or slopes with excellent drainage give you the best chance of overwintering successfully. Heavy clay soil common in parts of Missoula is the main thing to watch for.
Rosemary: Treat It Like an Annual
Rosemary is reliably perennial in warmer climates, but Missoula winters are too cold for it to survive outside. Treat it as an annual, or bring it indoors in a pot before hard freezes arrive in fall. Indoors with a sunny window, it does fine through winter and can go back out in spring.
If you grow rosemary in a container all summer rather than in the ground, moving it inside is simple. In the ground, you either dig and pot it in fall or plan to replace it each season.
Herbs That Prefer Cool Weather
Cilantro is a cool-season herb that bolts quickly once summer heat arrives. In Missoula, plant it in early May and expect it to produce well through June. When July heat kicks in it will go to seed fast. The good news is that you can sow it again in late August for a strong fall crop, and the seeds it drops in summer often self-sow and come up on their own in fall.
Parsley handles cold much better than most herbs and can be started early in the season. It is technically a biennial, meaning it grows leaves in its first year and goes to seed in its second. In Missoula it usually gets cut down by winter before the second-year cycle happens, so most gardeners treat it as an annual. It produces steadily all season without bolting the way cilantro does.
Dill can be direct sown in spring and grows quickly. It tends to bolt in heat but self-seeds readily, so once you have it in your garden it tends to show up again on its own each year. If you want dill for the fronds rather than seeds, successive sowings every few weeks keeps fresh growth coming. For growing vegetables alongside your herbs, the Missoula vegetable growing guide covers the full range of crops that work here.
Basil Needs the Most Attention
Basil is the highest-maintenance herb you will grow in Missoula, and it is worth knowing that going in. It cannot tolerate frost, does not like temperatures below 50 degrees even on summer nights, and turns black if it gets cold or wet at the wrong moment.
Do not plant basil outdoors until nighttime temperatures are reliably above 55 degrees. In Missoula, that usually means waiting until early June. The Missoula frost dates and planting calendar is worth bookmarking for tracking when nights are reliably warm enough. Even a brief cold night in late May can set the plant back significantly or kill young seedlings outright.
Plant basil in your warmest, most protected spot. Full sun is non-negotiable. If you are growing it in containers, bring them inside on nights when temperatures are forecast to drop below 50.
Pinch flower buds off as soon as they appear. Once basil flowers, it puts all its energy into seed production and the leaves get smaller and less flavorful. Pinching keeps it producing good foliage all the way to the end of the season.
A Few General Notes
Most herbs prefer well-drained soil on the leaner side. Rich, heavily amended soil tends to produce lots of lush leaves with less concentrated flavor. Herbs that evolved in dry Mediterranean climates, like thyme, oregano, sage, and rosemary, actually do better with less fertilizer and less water than most people give them.
Containers work very well for herbs in Missoula. They let you move cold-sensitive herbs indoors easily, keep aggressive spreaders like mint contained, and warm up faster in spring than in-ground beds. If you do not have much garden space, a few containers in a sunny spot will grow more herbs than a household typically uses.
If you want help planning a kitchen garden or figuring out how to use your outdoor space well here in Missoula, Garden City Plant Care offers vegetable garden consulting tailored to this climate. Reach out and we can talk through what would work best for your yard.