🍠 Can I Plant Radish in St. Paul, MN?

2026 planting guide for Zone 4b · Last frost ~May 10 · Growing season ~146 days

✅ YES — Good time to plant for a fall harvest

Radish thrives in cool weather and can be planted now for a fall harvest. Sow seeds soon — they'll be ready around Aug 21–Aug 29, well before the average first frost around Nov 10.

Planting window: Jul 30 – Aug 13
Sow radish seeds directly now for a fall harvest. Expect to harvest around Aug 21.
Live result based on current forecast for St. Paul, MN · Updates every 6 hours
USDA Zone
4b
Last Spring Frost
~May 10
First Fall Frost
October 3
Growing Season
~146 days
Ideal Temp for Radish
40–65°F
Frost Risk
✅ Tolerant

Growing Radish in St. Paul

St. Paul shares Minneapolis's Zone 4b climate on the Mississippi River, with a compressed growing season of approximately 145 days. Despite the short window, the intense summer daylight and warm July temperatures allow impressive vegetable production. Focus on short-season varieties, start seeds indoors in April, and use season extension tools like row covers on both ends of the season to maximize yields.

In St. Paul (last frost around May 10), radish can go out around March — approximately 6 weeks before the last expected frost, making it an early-season opportunity.

Radish thrives between 40°F and 65°F. It tolerates temperatures as low as 32°F, making it a candidate for early spring planting before the last frost date. Expect 22–30 days from transplant to first harvest. One of the fastest vegetables. Spring or fall.

Frequently Asked Questions

When can I plant radish in St. Paul, MN?

In St. Paul (last frost around May 10), radish 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 St. Paul?

St. Paul, MN is in USDA Plant Hardiness Zone 4b. The last expected spring frost is around May 10, and the first fall frost arrives around October 3. This zone classification helps you understand which perennials survive winter and when annual vegetables can safely go outdoors.

Is it safe to plant radish outside in St. Paul right now?

That depends on the current weather forecast. Radish needs temperatures above 32°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 radish in St. Paul 2026?

Yes — Radish grows well in St. Paul, MN. With a Zone 4b climate and a growing season of ~146 days, St. Paul is well-suited for cool-season crops like radish. As a frost-tolerant crop, radish can even go out a few weeks before the last frost date.

Grow Radish in Other Cities

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