When to Plant Mint
Planting Window
- Transplant (into a container)
- 2-3 weeks before last frost
| USDA Zone | Typical Window |
|---|---|
| Zone 5 and colder | April; dies back and returns from the roots |
| Zone 6-7 | March-April; growth may only slow over a mild winter |
| Zone 8 and warmer | Nearly any time; often stays green through winter |
Mint is a genuinely frost-hardy perennial, and its planting timing is straightforward - the real planning question isn't when to plant it, but where and how, since mint's aggressive spreading rhizomes make containment a decision that needs to happen before planting, not after.
Starting From Cuttings or Nursery Plants
Mint is rarely started from seed, since named varieties don't come true from seed given how readily the genus cross-breeds - cuttings from an existing plant root easily in water within a couple of weeks, and nursery-bought starts establish quickly, both faster and more reliable routes than seed for this particular herb.
Transplanting, Into a Container
Transplant mint two to three weeks before the last frost date, into a true container or a bottomless bucket sunk into the soil - doing this at planting time rather than after mint has already spread into open garden soil is meaningfully easier, since separating an established, spreading mint patch back out of a shared bed later is genuinely difficult.
Different Mint Varieties Share the Same Timing, Not the Same Container
Peppermint, spearmint, chocolate mint, and other named varieties all share identical frost tolerance and transplant timing, but planting more than one variety in the same container risks them mingling and losing distinct identity over time as rhizomes tangle together - separate containers per variety preserve the distinct flavors better than one shared pot does.
Refreshing an Old Container Planting
A mint container left undivided for several years can get root-bound and decline in vigor even inside its containment - digging up and replanting a healthy section from the outer edge into fresh potting soil, similar in spirit to dividing an aging chive or oregano clump, restores productivity better than simply feeding a tired, congested container.
Harvest for Drying Just Before Flowering
Mint leaves are highest in essential oil, and therefore flavor, just before the plant flowers - harvesting a full cutting back at that point, rather than letting it flower and go somewhat woody, both gives the best-tasting leaves for drying and encourages a fresh, bushier regrowth for a second harvest later in the season.
Zone boundaries follow the USDA Plant Hardiness Zone Map (2023 revision); frost windows reflect NOAA/NCEI climate normals. Both are typical historical ranges, reviewed annually - not a forecast or a guarantee for any single year. See Methodology & Sources.
Frequently Asked Questions
Can I keep a mint plant going indoors on a windowsill through winter instead of losing it to cold?
Yes, and mint is genuinely one of the easier herbs to keep indoors - it tolerates the lower light of a bright windowsill better than many sun-loving herbs, and a healthy indoor pot can supply usable leaves through the colder months when an in-ground or outdoor container planting has died back. It still slows down noticeably compared to a plant growing outdoors in season, so don't expect the same volume of growth.
My mint leaves have developed small orange, rust-colored spots - what is that?
That's almost certainly mint rust, a fungal disease that specifically targets mint and spreads readily in crowded, humid growing conditions with poor airflow. Thinning a dense container planting and spacing divisions further apart helps prevent it, but an already-infected plant is difficult to fully clear since the fungus can persist in the rhizome - in a bad, recurring case, starting over with a fresh cutting from unaffected growth is often more effective than trying to treat the original plant.
My mint already escaped its container into the garden bed - how do I get it back under control now?
Dig out as much of the rhizome as you can find, expecting to miss some - mint regrows from even small root fragments left behind, so full removal from open soil typically takes more than one pass over a season rather than a single cleanup. Sifting the soil in the affected area as you go, and staying on top of any new shoots that pop up afterward, gets you there faster than digging once and assuming the job is finished.