Planting Guides
When to Plant Peppers in Salt Lake City: Complete Guide + Best Varieties for Zone 7a
Salt Lake City, Utah
USDA Zone 7a
Last Frost: Apr 25
Last updated: October 30, 2025
Plant peppers in Salt Lake City after May 2 when night temperatures stay above 55°F. Zone 7a's 173-day season supports most varieties with proper timing.
— Image © PlantReference.org 2026
Quick Answer
Start pepper seeds indoors March 1-8 in Salt Lake City. Transplant outdoors May 2-9 after last frost April 25.
TL;DR
Plant pepper seeds indoors March 1-8 in Salt Lake City for transplanting after May 2 when nighttime temperatures stay above 55°F consistently. Zone 7a's 173-day growing season supports all pepper varieties with jalapeños, poblanos, and bell peppers being most reliable. Use black plastic mulch or containers to warm soil faster in Salt Lake's high-altitude spring conditions.
Frequently Asked Questions
When is the last frost date in Salt Lake City?
Salt Lake City's average last frost date is April 25, but this can vary by 1-2 weeks depending on elevation and specific location within the valley. Higher elevations and areas near the mountains may experience frost into early May, while lower valley locations might be frost-free by mid-April. Always check 10-day forecasts before transplanting peppers outdoors, and have protection ready for unexpected late cold snaps.
Can I grow habaneros successfully in Salt Lake City?
Yes, but habaneros require special attention in Salt Lake City's Zone 7a climate. These Capsicum chinense 'Habanero' varieties need 90-100 days of consistently warm weather to mature properly. Container growing is your best strategy—use at least 5-gallon containers positioned against south-facing walls to maximize heat accumulation. Start seeds indoors by March 1 and be prepared to bring containers indoors during unexpected cool spells.
Why do my pepper plants stop growing after transplanting?
This "sulking" behavior occurs when soil temperatures are below 60°F despite warm air temperatures. Salt Lake's clay soils warm slowly in spring, and peppers planted in cool soil become dormant until conditions improve. Prevention is key: use black plastic mulch 2-3 weeks before transplanting to pre-warm soil, or wait until soil temperatures are consistently above 60°F before transplanting outdoors.
How do I prevent sunscald on my peppers?
Salt Lake City's high altitude (4,300 feet) creates intense UV radiation that can burn pepper fruit. Install 30-50% shade cloth during the hottest part of summer (July-August), especially over large-fruited varieties. Maintain adequate foliage by avoiding over-pruning, and choose thick-walled varieties like Capsicum annuum 'California Wonder' that naturally resist UV damage. Position plants where they receive morning sun but some afternoon shade.
What's the best watering schedule for peppers in Salt Lake's dry climate?
Deep, infrequent watering works best in Salt Lake's arid conditions. Water 2-3 times per week, providing 1-2 inches each time rather than daily light watering. Install drip irrigation to deliver water directly to root zones and reduce evaporation losses. Check soil moisture 2 inches deep—water when the top inch feels dry but soil below is still slightly moist. Apply 2-3 inches of organic mulch to reduce evaporation.
When should I start pepper seeds indoors for Salt Lake City?
Start seeds March 1-8 for optimal timing in Salt Lake City. This provides 8 weeks of indoor growing time before transplanting after May 2. Pepper seeds need warm conditions (80-85°F) to germinate properly, so use heat mats in Salt Lake's typically cool spring weather. Seeds usually germinate in 7-14 days, with Capsicum chinense 'Habanero' varieties taking up to 21 days.
Can I grow a second crop of peppers in fall?
Yes, quick-maturing varieties can be grown for fall harvest in Salt Lake City. Start seeds in late May for transplanting by July 15. Capsicum annuum 'Shishito' (60 days) and early jalapeños (65-70 days) will mature before the October 15 first frost. This strategy works best with container growing, allowing you to move plants to protection during early cold snaps and extend harvest into November.
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Dorothy "Dot" Williams
Dot grew up on a small farm in rural Virginia and has maintained a vegetable garden for decades. After retiring from teaching elementary school, she became a Master Gardener volunteer and spends her time mentoring new gardeners at community garden plots in Richmond. She's especially knowledgeable about heirloom varieties, seed saving, and traditional growing methods passed down from her grandmother. Dot's no-nonsense advice comes from extensive trial and error—she's seen every tomato disease, pest problem, and weather disaster imaginable. Her biggest pet peeve is gardeners who overcomplicate simple tasks. "Plants want to grow," she often says. "Your job is to not get in their way."
