Zone 3 · Herbs Growing Guide

When to Plant Oregano
in Zone 3

Perennial Mediterranean herb that gets more flavourful in hot dry conditions. Greek oregano is most aromatic. Harvest before flowering — flavour is strongest just before flowers open.

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

Cold-hardy perennial to Zone 3. Dies back in winter, returns reliably in spring.

Care Guide

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

Cold-hardy perennial to Zone 3. Dies back in winter, returns reliably in spring.

Feeding Schedule

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

Like all Mediterranean herbs, over-feeding reduces flavour. One light feed in spring is ideal.

Companion Planting for Oregano

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

Grows well with
  • Tomatoes
  • Peppers
  • Beans
  • Brassicas
Keep away from
  • Basil
  • Mint

These guides get better when growers like you contribute. If something’s wrong or you’ve learned something worth sharing, we’d love to hear it.

What needs correcting?

What should it say?

Your zone (optional)

Thanks — we'll review this and update the guide if needed.

Your growing tip for Oregano

Your name (optional)

Your zone (optional)

Tips are reviewed before publishing. Accepted tips earn you a Founding Grower badge when the plant app launches.

Thanks for contributing! We'll review your tip and be in touch before launch.

Common questions

In Zone 3, start oregano seeds indoors around Apr 1 – Apr 15, then transplant outdoors May 15 – Jun 1 after your last frost around May 15. Cold-hardy perennial to Zone 3. Dies back in winter, returns reliably in spring.
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 oregano include Tomatoes, Peppers, Beans, Brassicas. Avoid planting near Basil, Mint, which can compete for nutrients or attract pests.
Oregano 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

Track your Oregano in plant

Get a live traffic light for every crop in your garden — zone-aware planting calendar, real-time weather alerts, and a community of growers near you.

Be first to back on Kickstarter and lock in the founding price.

Oregano in other zones
Crop Guides