When should I plant Lavender in Zone 4a?

Start Lavender seeds indoors around Feb 24. Transplant outdoors after May 12. Expect first harvest around Aug 10.

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 Lavender in Zone 4a?

Yes. Lavender needs 100 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.

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🟣 Growing Lavender in Zone 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Lavender in this zone. Last frost: May 5. First frost: Oct 1.

Planting Calendar

Indoor

Outdoor

Harvest

Feb 24Oct 1

Season: May 5 – Oct 1 (149 days)

Zone4a

Last FrostMay 5

First FrostOct 1

Season Length149 days

Days to Harvest100

SunFull Sun

Frost ToleranceModerate

Spacing1/sqft (12" apart)

When to Plant Lavender in Zone 4a

Start Seeds Indoors: Feb 24

Start Lavender seeds indoors around Feb 24 (10 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 14–28 days.

Transplant Outdoors: May 12

Transplant Lavender seedlings outdoors after May 12. Wait until soil temperature reaches 55°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Aug 10

First harvest approximately Aug 10 (~90 days from transplant). Continue harvesting until first frost (Oct 1). Lavender can overwinter in mild climates for continued harvest.

Companion Planting

✅ Roses✅ Eggplant✅ Tomatoes✅ Cabbage

Lavender 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 13b

Plan Your Lavender Garden

Track Lavender from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

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