When to Plant Snapdragon in Altus, Oklahoma (73521)

Location

Altus, Oklahoma

ZIP Code

73521

USDA Zone

Last Frost

Sunday, April 5, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Sunday, February 8, 2026

Transplant Outdoors

Sunday, April 19, 2026

Based on last frost Sunday, April 5, 2026 · Zone 7b

Pro tip: Start Snapdragon seeds indoors 8 weeks before your last frost date, then transplant outdoors around Sunday, April 19, 2026.

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🌿 Plant Details

Scientific Name Antirrhinum majus

Days to Maturity 60 days

Mature Height 12-36"

Spread 12"

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 10-21 days

Ready to Plant Snapdragon in Altus?

Get your seeds now so they're ready by Sunday, February 8, 2026.

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🤝 Good Companions

TomatoVegetable Garden

🤝

Full Companion Planting Guide for Snapdragon

See which plants help Snapdragon thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow seed pods to dry and turn brown on the spike. Small holes in pods will open when ripe.

Processing

Shake dry pods over a bowl to collect tiny seeds. Dry 1 additional week.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Many snapdragons are OP but some are hybrid. Seeds are tiny — handle carefully during collection.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 32 plants of Snapdragon. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Snapdragon in Altus, Oklahoma? +

In Altus (Zone 7b), start Snapdragon seeds indoors around Sunday, February 8, 2026 and transplant outdoors around Sunday, April 19, 2026.

What is the last frost date for Altus, Oklahoma? +

The average last spring frost date for Altus, Oklahoma (ZIP 73521) is around Sunday, April 5, 2026. This is based on NOAA climate normals for USDA Zone 7b.

How long does Snapdragon take to grow? +

Snapdragon typically matures in about 60 days from transplanting. In Altus, that means you can expect harvest around Sunday, April 19, 2026 plus 60 days.

Should I start Snapdragon indoors or direct sow in Oklahoma? +

Snapdragon should be started indoors 8 weeks before your last frost date. In Altus, that means starting around Sunday, February 8, 2026.

📚 More Snapdragon Planting Guides

🗺️

Snapdragon in Oklahoma

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 7b Snapdragon Guide

All cities in your zone · Avg dates

→

Other Plants for Altus

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Growing Snapdragon in Zone 7b

Snapdragon (Antirrhinum majus) is a popular garden vegetable. In Altus, Oklahoma, which is in USDA Hardiness Zone 7b, you should start seeds indoors around Sunday, February 8, 2026.

Your average last frost date is Sunday, April 5, 2026. Plan to transplant your Snapdragon seedlings outdoors around Sunday, April 19, 2026, about 2 weeks after your last frost date.