🥬 Can I Plant Arugula in Denver, CO?

2026 planting guide for Zone 5b · Last frost ~May 7 · Growing season ~153 days

✅ YES — Good time to plant for a fall harvest

Arugula thrives in cool weather and can be planted now for a fall harvest. Sow seeds soon — they'll be ready around Aug 19–Sep 8, well before the average first frost around Nov 2.

Planting window: Jul 30 – Aug 13
Sow arugula seeds directly now for a fall harvest. Expect to harvest around Aug 19.
Live result based on current forecast for Denver, CO · Updates every 6 hours
USDA Zone
5b
Last Spring Frost
~May 7
First Fall Frost
October 7
Growing Season
~153 days
Ideal Temp for Arugula
40–65°F
Frost Risk
✅ Tolerant

Growing Arugula in Denver

Denver's Zone 5b location at 5,280 feet elevation means gardeners face late spring frosts (sometimes into May) and early fall frosts (as early as late September). The intense high-altitude sun and dry air accelerate both plant growth and water loss. Row covers, raised beds, and careful timing are key to Denver gardening success.

In Denver (last frost around May 7), arugula can go out around March — approximately 6 weeks before the last expected frost, making it an early-season opportunity.

Arugula thrives between 40°F and 65°F. It tolerates temperatures as low as 28°F, making it a candidate for early spring planting before the last frost date. Expect 20–40 days from transplant to first harvest. Fast-growing. Bolts quickly in heat — succession plant every 2 weeks.

Frequently Asked Questions

When can I plant arugula in Denver, CO?

In Denver (last frost around May 7), arugula can go out around March — approximately 6 weeks before the last expected frost, making it an early-season opportunity.

What is the USDA hardiness zone for Denver?

Denver, CO is in USDA Plant Hardiness Zone 5b. The last expected spring frost is around May 7, and the first fall frost arrives around October 7. This zone classification helps you understand which perennials survive winter and when annual vegetables can safely go outdoors.

Is it safe to plant arugula outside in Denver right now?

That depends on the current weather forecast. Arugula needs temperatures above 28°F (ideally 40–65°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 arugula in Denver 2026?

Yes — Arugula grows well in Denver, CO. With a Zone 5b climate and a growing season of ~153 days, Denver is well-suited for cool-season crops like arugula. As a frost-tolerant crop, arugula can even go out a few weeks before the last frost date.

Grow Arugula in Other Cities

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

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