Zone 3 · Fruiting Veg Growing Guide

When to Plant Celery
in Zone 3

The most demanding crop in this guide — needs consistent moisture, steady cool temperatures, and a very long season. But homegrown celery has a depth of flavour you'll never find in a supermarket. Start early, be patient.

Plant outdoors
May 20 – Jun 5
Start indoors
Mar 5 – Mar 20
Last Frost
~May 15
Days to harvest
100–130 days
Difficulty
Hard
Start indoors — Zone 3
Harvest window: Aug – Oct

Planting Calendar

In Zone 3, Celery should be planted outdoors May 20 – Jun 5, after the average last frost date of approximately May 15. Start seeds indoors around Mar 5 – Mar 20 for a head start.

Start 10–12 weeks early. Celery germinates slowly at 65–70°F — don't rush. Barely feasible in Zone 3 — choose fast-maturing varieties like Tango.

Care Guide

Sunlight
Full sun to partial shade · 4–8 hrs/day
Watering
High
Spacing
8–10 inches
Soil
Rich, moisture-retentive, well-draining
Days to maturity
100–130 days
Soil pH
6.0–7.0
plant tip · Zone 3

Start 10–12 weeks early. Celery germinates slowly at 65–70°F — don't rush. Barely feasible in Zone 3 — choose fast-maturing varieties like Tango.

Feeding Schedule

How often
every 2 weeks
Feed type
high nitrogen
Key timing
throughout growing season

One of the heaviest feeders in the vegetable garden. Liquid feed every 2 weeks. Inconsistent feeding produces stringy, bitter stalks.

Companion Planting for Celery

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

Grows well with
  • Tomatoes
  • Brassicas
  • Beans
  • Leeks
Keep away from
  • Corn
  • Fennel
  • Parsnips

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 Celery

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 celery seeds indoors around Mar 5 – Mar 20, then transplant outdoors May 20 – Jun 5 after your last frost around May 15. Start 10–12 weeks early. Celery germinates slowly at 65–70°F — don't rush. Barely feasible in Zone 3 — choose fast-maturing varieties like Tango.
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 celery include Tomatoes, Brassicas, Beans, Leeks. Avoid planting near Corn, Fennel, Parsnips, which can compete for nutrients or attract pests.
Celery typically takes 100–130 days from transplant or direct sow to harvest in Zone 3. Expected harvest window: Aug – Oct.

Free app · iOS February 2028

Track your Celery 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.

Celery in other zones
Crop Guides