When to Plant Sweet Corn in Regina, SK
Published: April 24, 2026 · Updated: April 27, 2026
Direct sow after last frost when soil reaches 60°F. Plant in blocks of at least 4 rows for wind pollination. Succession plant every 2 weeks for continuous harvest.
Regina's Canadian Zone 3b (USDA 3a) semi-arid continental climate is very similar to Saskatoon but Regina is one of Canada's windiest cities — wind protection is critical for young plants. At 125 frost-free days and minimal natural windbreaks on the flat prairie, sheltered microclimates matter.
Sweet Corn Planting Calendar for Regina
Direct sow outdoors: May 25–June 4
Harvest window: July 29 – August 23
Minimum soil temperature: 16°C (60°F)
Days to harvest: 65–90 days
Sun requirement: Full sun (8+ hours)
⚠ Direct sow corn after last frost when soil reaches 60°F. Plant in blocks of at least 4 rows for pollination. Succession plant every 2 weeks for continuous harvest.
Regina Climate Notes
Regina's flat terrain offers no natural windbreaks. Use a sheltered south-facing garden wall or fence to create a warmer microclimate. Black plastic mulch warms soil 2-4°C and extends the effective season. Wind-resistant varieties and windbreak planting are standard practice for serious Regina gardeners.
Growing Tips for Sweet Corn
- Plant in blocks of at least 4 rows × 4 plants, not single rows — corn is wind-pollinated and single rows produce deformed ears.
- Sow successively every 2 weeks until 90 days before first fall frost for continuous harvest through summer.
- Side-dress with nitrogen when plants are knee-high and again at tasseling — corn is an extremely heavy feeder.
- Test for ripeness by puncturing a kernel: clear liquid is under-ripe, milky liquid is perfect, pasty is over-ripe.
Companion Planting in Regina
Pair sweet corn with Bush Bean, Pumpkin, Squash, Cucumber for mutual benefit. Avoid planting near Tomato, Celery, which compete with or inhibit sweet corn growth.
Pests and Problems to Watch in Regina
The most common pest and disease pressure on sweet corn in Regina comes from Corn Earworm, Cutworm, Corn Rootworm, Raccoons. Floating row covers through the first 4–6 weeks after planting block adult pests from laying eggs, and a weekly scouting routine catches infestations before they damage the crop.
Other Saskatchewan Cities
Frequently Asked Questions
When do I plant sweet corn in Regina?
Regina's last spring frost is around May 18. Direct sow May 25–June 4.
What Canadian hardiness zone is Regina?
Regina is in Canadian Zone 3b (USDA equivalent 3a). The semi-arid windy Prairie climate delivers 125 frost-free days from May 18 to September 20, which shapes every planting date in the local calendar.
How long is Regina's growing season?
Regina has 125 frost-free days — from May 18 in spring to September 20 in fall. That is more than enough time to finish a full sweet corn crop (65–90 days to maturity) before the first fall frost.
Can I grow sweet corn in containers in Regina?
Yes. Container growing on balconies and decks is practical in Regina — choose a 5-gallon or larger dark-coloured container to warm the root zone, use a high-quality potting mix, and water daily during hot summer weather. In Canadian Zone 3–4, a sheltered south-facing location adds 2–3 weeks to the effective season.
What is the first fall frost in Regina?
Regina's average first fall frost is September 20. Most sweet corn in Regina is a single spring-timed planting designed to harvest before the first fall frost.