Zone 3 · Herbs Growing Guide

When to Plant Thyme
in Zone 3

Drought-tolerant perennial that thrives on neglect. Perfect border plant. Harvest before flowering for strongest flavour. Woody perennial — prune to prevent legginess.

Plant outdoors
May 15 – Jun 1
Start indoors
Mar 15 – Apr 1
Last Frost
~May 15
Days to harvest
60–90 days
Difficulty
Easy
Start indoors — Zone 3
Harvest window: Jun – Oct

Planting Calendar

In Zone 3, Thyme should be planted outdoors May 15 – Jun 1, after the average last frost date of approximately May 15. Start seeds indoors around Mar 15 – Apr 1 for a head start.

Cold-hardy perennial in Zone 3. Dies back in winter, returns reliably. Good drainage is essential.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Low
Spacing
12–18 inches
Soil
Sandy, well-draining, low fertility
Days to maturity
60–90 days
Soil pH
6.0–8.0
plant tip · Zone 3

Cold-hardy perennial in Zone 3. Dies back in winter, returns reliably. Good drainage is essential.

Feeding Schedule

How often
once a season
Feed type
balanced (10-10-10)
Key timing
early spring

Light feeder — excess feeding reduces aromatic oils. One light feed in spring when growth begins is all that's needed.

Companion Planting for Thyme

What you plant next to thyme makes a real difference — some plants actively help, others compete or attract pests.

Grows well with
  • Brassicas
  • Tomatoes
  • Eggplant
  • Strawberries
Keep away from
  • Basil
  • Mint

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Common questions

In Zone 3, start thyme seeds indoors around Mar 15 – Apr 1, then transplant outdoors May 15 – Jun 1 after your last frost around May 15. Cold-hardy perennial in Zone 3. Dies back in winter, returns reliably. Good drainage is essential.
Zone 3 has an average last spring frost of approximately May 15 and a first fall frost around Sep 15. These dates vary by specific location — use your ZIP code in the plant app for precision based on the nearest NOAA weather station.
Good companion crops for thyme include Brassicas, Tomatoes, Eggplant, Strawberries. Avoid planting near Basil, Mint, which can compete for nutrients or attract pests.
Thyme typically takes 60–90 days from transplant or direct sow to harvest in Zone 3. Expected harvest window: Jun – Oct.

Free app · iOS February 2028

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Thyme in other zones
Crop Guides