When to Plant Serrano Pepper in Deep River, Iowa (52222)

Location

Deep River, Iowa

ZIP Code

52222

USDA Zone

Last Frost

Saturday, April 25, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Saturday, February 14, 2026

Transplant Outdoors

Saturday, May 9, 2026

Based on last frost Saturday, April 25, 2026 · Zone 5b

Pro tip: Start Serrano Pepper seeds indoors 10 weeks before your last frost date, then transplant outdoors around Saturday, May 9, 2026.

🌿 Plant Details

Scientific Name Capsicum annuum

Days to Maturity 80 days

Mature Height 24-36"

Spread 18"

Type Bush

Fruit Size Small (1-2 inches)

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 7-14 days

Ready to Plant Serrano Pepper in Deep River?

Get your seeds now so they're ready by Saturday, February 14, 2026.

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🤝 Good Companions

BasilCarrotTomato

⚠️ Avoid Planting Near

Fennel

See the full companion planting guide for Serrano Pepper →

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow peppers to fully ripen red on the plant.

Processing

Remove seeds carefully — serrano is quite hot. Dry flat for 1–2 weeks. Gloves recommended.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

C. annuum — crosses freely with other annuum peppers. Isolate by 300 feet for pure seed.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 14 plants of Serrano Pepper. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Serrano Pepper in Deep River, Iowa? +

In Deep River (Zone 5b), start Serrano Pepper seeds indoors around Saturday, February 14, 2026 and transplant outdoors around Saturday, May 9, 2026.

What is the last frost date for Deep River, Iowa? +

The average last spring frost date for Deep River, Iowa (ZIP 52222) is around Saturday, April 25, 2026. This is based on NOAA climate normals for USDA Zone 5b.

How long does Serrano Pepper take to grow? +

Serrano Pepper typically matures in about 80 days from transplanting. In Deep River, that means you can expect harvest around Saturday, May 9, 2026 plus 80 days.

Should I start Serrano Pepper indoors or direct sow in Iowa? +

Serrano Pepper should be started indoors 10 weeks before your last frost date. In Deep River, that means starting around Saturday, February 14, 2026.

📚 More Serrano Pepper Planting Guides

🗺️

Serrano Pepper in Iowa

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 5b Serrano Pepper Guide

All cities in your zone · Avg dates

→

Other Plants for Deep River

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Growing Serrano Pepper in Zone 5b

Serrano Pepper (Capsicum annuum) is a popular garden vegetable. In Deep River, Iowa, which is in USDA Hardiness Zone 5b, you should start seeds indoors around Saturday, February 14, 2026.

Your average last frost date is Saturday, April 25, 2026. Plan to transplant your Serrano Pepper seedlings outdoors around Saturday, May 9, 2026, about 2 weeks after your last frost date.