When to plant tarragon in Tulsa, Oklahoma

March 31 – April 14

Transplant outdoors · typical Tulsa year

Climate basis: NOAA station Tulsa INTL AP, OK (USW00013968), 7 mi (11 km) from downtown Tulsa (ZCTA 74103 centroid), elevation 650 ft, on the 1991–2020 climate normals. Transplant tarragon outdoors from approximately the dates above, anchored to the median last spring 32°F freeze (March 31). One year in ten still freezes after April 15.

Last spring freezeMarch 311-in-10 after Apr 15

First fall freezeNovember 41-in-10 before Oct 20

Frost-free season≈ 220 daysmedian at 32°F

Hard freeze, 28°Mar 17 – Nov 13kills even hardy greens

USDA zone7b5 to 10°F winter low — not frost timing

The Tulsa year

Transplant outdoorsMar 31 – Apr 14

indoors under lights
in the garden
frost-free season
1-in-10 years still freeze to Apr 15

Tarragon in Tulsa · freeze context from Tulsa INTL AP, OK, 1991–2020 normals.

Every method, with its sources

Transplant outdoors

Mar 31 – Apr 14

USU Extension says to transplant French tarragon in the spring after the last frost so the tender young shoots survive, a point rule that opens a two-week planting span at the last spring freeze. Anchored to the median last spring freeze (Mar 31). Utah State University Extension · Virginia Cooperative Extension, Virginia Tech

Start seeds indoors

Not calculated

The cited extension guides do not time an indoor seed-starting window for this crop.

Direct-sow outdoors

Not calculated

The cited extension guides do not time direct sowing for this crop.

Fall planting

Not calculated

No source-backed fall planting rule exists for this crop in the registry, so no fall window is calculated.

Variety assumption: Assumes French tarragon, which Virginia Cooperative Extension says can only be propagated asexually — seed-grown plants are the flavourless Russian type — so no seed-sowing window is given.

These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.

This week, not a typical year:

Crop rule sources (2)

Utah State University Extension: How to Grow French Tarragon in Your Garden (accessed 2026-07-25)
"Transplant French tarragon in the spring, after the last frost, to ensure the survival of tender young shoots."
Virginia Cooperative Extension, Virginia Tech: Herb Culture and Use (Publication 426-420) (accessed 2026-07-25)
"In addition, many culinary herbs, such as tarragon, can only be propagated asexually; seed-grown plants lack the oils that give them flavor."

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