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🌺 Growing Nasturtium in Zone 3b

Zone 3b has harsh winters and a short growing season. Start Nasturtium early indoors to maximize your harvest window. Last frost: May 15. First frost: Sep 22.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 17Sep 22

Season: May 15 – Sep 22 (130 days)

Zone3b

Last FrostMay 15

First FrostSep 22

Season Length130 days

Days to Harvest45

SunFull Sun

Frost ToleranceNone

Spacing4/sqft (6" apart)

When to Plant Nasturtium in Zone 3b

Start Seeds Indoors: Apr 17

Start Nasturtium seeds indoors around Apr 17 (4 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 7–14 days.

Transplant Outdoors: May 22

Transplant Nasturtium seedlings outdoors after May 22. Wait until soil temperature reaches 55°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Jul 1

First harvest approximately Jul 1 (~40 days from transplant). Continue harvesting until first frost (Sep 22).

Companion Planting

✅ Cucumbers✅ Squash✅ Pumpkins✅ Radishes✅ Cabbage

Nasturtium 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

Frequently Asked Questions

When should I plant Nasturtium in Zone 3b?

Start Nasturtium seeds indoors around Apr 17. Transplant outdoors after May 22. Expect first harvest around Jul 1.

What is the last frost date for Zone 3b?

The average last spring frost date for Zone 3b is May 15. The first fall frost averages Sep 22, giving a 130-day growing season.

Can I grow Nasturtium in Zone 3b?

Yes. Nasturtium needs 45 days to harvest. Zone 3b has a 130-day growing season, which is sufficient.

What is the best month to plant Nasturtium in Zone 3b?

The best time to start Nasturtium in Zone 3b is Apr. Begin seeds indoors around Apr 17, then transplant outdoors after the last frost date of May 15.

What companion plants grow well with Nasturtium?

Good companion plants for Nasturtium include Cucumbers, Squash, Pumpkins, Radishes, Cabbage.

How long does Nasturtium take to harvest?

Nasturtium takes approximately 45 days from planting to harvest. In Zone 3b, expect your first harvest around Jul 1.

Plan Your Nasturtium Garden

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

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