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🌺 Growing Nasturtium in Zone 4b

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

Planting Calendar

Indoor

Outdoor

Harvest

Apr 3Oct 5

Season: May 1 – Oct 5 (157 days)

Zone4b

Last FrostMay 1

First FrostOct 5

Season Length157 days

Days to Harvest45

SunFull Sun

Frost ToleranceNone

Spacing4/sqft (6" apart)

When to Plant Nasturtium in Zone 4b

Start Seeds Indoors: Apr 3

Start Nasturtium seeds indoors around Apr 3 (4 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 7–14 days.

Transplant Outdoors: May 8

Transplant Nasturtium seedlings outdoors after May 8. Wait until soil temperature reaches 55°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Jun 17

First harvest approximately Jun 17 (~40 days from transplant). Continue harvesting until first frost (Oct 5).

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 4b?

Start Nasturtium seeds indoors around Apr 3. Transplant outdoors after May 8. Expect first harvest around Jun 17.

What is the last frost date for Zone 4b?

The average last spring frost date for Zone 4b is May 1. The first fall frost averages Oct 5, giving a 157-day growing season.

Can I grow Nasturtium in Zone 4b?

Yes. Nasturtium needs 45 days to harvest. Zone 4b has a 157-day growing season, which is sufficient.

What is the best month to plant Nasturtium in Zone 4b?

The best time to start Nasturtium in Zone 4b is Apr. Begin seeds indoors around Apr 3, then transplant outdoors after the last frost date of May 1.

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 4b, expect your first harvest around Jun 17.

Plan Your Nasturtium Garden

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

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