Growing french tarragon in zone 4a
(Zone 4a = an average winter low of -30°F to -25°F.)
In USDA zone 4a, the typical last spring frost is May 12 and the first fall frost is September 28. Here is when to plant french tarragon against those dates.
Typical timing
Zone 4a planting schedule
Evidence trail
How these dates are built
Sprout applies the cited planting offsets to the typical zone 4a frost anchors. The result is a planning baseline for the zone, not a local weather forecast.
- USDA Plant Hardiness Zone Map, 2023USDA Agricultural Research Service / Oregon State University PRISM Group. Supports the USDA hardiness-zone band.
- U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information. Supports the median spring and fall freeze dates.
- How to Grow French Tarragon in Your GardenUtah State University Extension. Supports outdoor transplant timing (normalized).
Method note
Perennial lifecycle (winter hardy to zone 4), full-sun requirement, transplant after the last frost, 24 inch spacing, once-a-week watering of established plants, pH 6.5-7.5, and the root-rot / overwatering concern from this page. French tarragon is propagated from cuttings and divisions rather than seed (it seldom flowers), so only a transplant window (anchored at the last frost) is recorded. Hardiness is given as a lower bound only (hardy to zone 4) with no upper bound, so zoneRange is omitted; no seed depth is given.
These are zone 4a averages
Computed from 795 ZIP codes in zone 4a. Your town's frost dates vary; enter your ZIP for dates built on your nearest weather station.
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Put these dates to work
The plant profile covers spacing, light, water, soil, and source-backed timing details.