Growing Leek in Zone 4a
Zone 4a has cold winters and a moderate growing season. Timing is key for Leek in this zone. Last frost: May 5. First frost: Oct 1.
Planting Calendar
Season: May 5 – Oct 1 (149 days)
When to Plant Leek in Zone 4a
Start Seeds Indoors: Feb 24
Start Leek seeds indoors around Feb 24 (10 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 7–14 days.
Transplant Outdoors: Apr 21
Transplant Leek seedlings outdoors after Apr 21. Wait until soil temperature reaches 45°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.
Harvest: Jul 20
First harvest approximately Jul 20 (~90 days from transplant). Continue harvesting until first frost (Oct 1). Leek can overwinter in mild climates for continued harvest.
Companion Planting
Leek in Other Zones
1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13bFrequently Asked Questions
When should I plant Leek in Zone 4a?
Start Leek seeds indoors around Feb 24. Transplant outdoors after Apr 21. Expect first harvest around Jul 20.
What is the last frost date for Zone 4a?
The average last spring frost date for Zone 4a is May 5. The first fall frost averages Oct 1, giving a 149-day growing season.
Can I grow Leek in Zone 4a?
Yes. Leek needs 120 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.
What is the best month to plant Leek in Zone 4a?
The best time to start Leek in Zone 4a is Feb. Begin seeds indoors around Feb 24, then transplant outdoors after the last frost date of May 5.
What companion plants grow well with Leek?
Good companion plants for Leek include Carrots, Onions, Celery. Avoid planting Leek near Beans, Peas.
How long does Leek take to harvest?
Leek takes approximately 120 days from planting to harvest. In Zone 4a, expect your first harvest around Jul 20.
Plan Your Leek Garden
Track Leek from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Leek Growing Guide