🌽 Can I Plant Corn in Spokane, WA?

2026 planting guide for Zone 6b · Last frost ~April 22 · Growing season ~172 days

⏳ WAIT — Too cold — lows near 53°F (min 55°F)

Corn needs nights consistently above 55°F to thrive. Current forecast lows of ~53°F are below that threshold. Wait for warmer overnight temperatures.

Planting window: Aug 13 – Aug 27
Wait until overnight lows are consistently above 55°F before planting.
Live result based on current forecast for Spokane, WA · Updates every 6 hours
USDA Zone
6b
Last Spring Frost
~April 22
First Fall Frost
October 11
Growing Season
~172 days
Ideal Temp for Corn
65–95°F
Frost Risk
⚠️ Sensitive

Growing Corn in Spokane

Spokane's Zone 6b inland Pacific Northwest climate differs significantly from Seattle's — less rain, more sun, and more extreme temperature swings. The Palouse region's continental climate means hot, dry summers ideal for tomatoes and peppers (a welcome contrast to rainy western Washington). The frost-free window of about 171 days is adequate for a wide range of crops when warm-season starts begin indoors in late March.

In Spokane (last frost around April 22), aim to direct sow or transplant corn outside around May — approximately 2 weeks after your last expected frost.

Corn thrives between 65°F and 95°F. It is frost-sensitive, meaning a single freeze at 32°F will damage or kill it — always wait until frost danger has fully passed. Expect 60–100 days from transplant to first harvest. Needs warm soil. Plant in blocks.

Frequently Asked Questions

When can I plant corn in Spokane, WA?

In Spokane (last frost around April 22), aim to direct sow or transplant corn outside around May — approximately 2 weeks after your last expected frost.

What is the USDA hardiness zone for Spokane?

Spokane, WA is in USDA Plant Hardiness Zone 6b. The last expected spring frost is around April 22, and the first fall frost arrives around October 11. This zone classification helps you understand which perennials survive winter and when annual vegetables can safely go outdoors.

Is it safe to plant corn outside in Spokane right now?

That depends on the current weather forecast. Corn needs temperatures above 55°F (ideally 65–95°F) to thrive. CanIPlant checks your real 7-day forecast and any active frost alerts to give you a live YES, NO, or WAIT answer — just enter your ZIP code.

Can I grow corn in Spokane 2026?

Yes — Corn grows well in Spokane, WA. With a Zone 6b climate and a growing season of ~172 days, Spokane is well-suited for warm-season crops like corn. Just wait until after the last frost (around April 22) before moving plants outside.

Grow Corn in Other Cities

New York, NYLos Angeles, CAChicago, ILHouston, TXPhoenix, AZPhiladelphia, PASan Antonio, TXSan Diego, CA

Get a live answer for your exact address

Enter your ZIP code — CanIPlant checks your real 7-day forecast, frost alerts, and 30-year climate data to tell you whether to plant corn right now.

Check My ZIP Code →