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Growing Park's Whopper in Zone 9a

Solanum lycopersicum

Varies for Zone 9a
F1 Hybrid

🌡️ USDA Hardiness Zone 9a

Subtropical/Mediterranean

USDA 2023 Verified
Growing Season
250-290 days
Winter Minimum
20°F to 25°F
(-6.7°C to -3.9°C)
Last Spring Frost
March 6
50% probability
First Fall Frost
November 21
50% probability
AHS Heat Zone 7-10
61 to 90 heat days per year • Moderate to High heat stress

Typical regions: Seattle WA, San Francisco Bay Area, Houston TX, Coastal Louisiana

📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Frost dates from NOAA station USW00024233 • Last verified: 1/22/2026

📊 Zone Compatibility Analysis

💾 Suitability computed by Solara Agricultural Intelligence Platform

📅 Zone 9a Planting Calendar for Park's Whopper

Based on NOAA climate normals for Zone 9a. Dates show 50% probability (average year).

🌱 Start Seeds Indoors
6-8 weeks before March 6
Approximately late winter to early spring
🪴 Transplant Outdoors
After March 6
When soil reaches 60°F+
🌾 Direct Sow (Alternative)
2 weeks after March 6
For warm-season crops
🥕 Expected Harvest
65-75 days after planting
Complete before November 21

💡 Zone 9a Growing Tips

  • • Growing season: 250-290 frost-free days
  • • ⚠️ Season extension required - consider cold frames or hoop houses
  • • Monitor soil temperature before transplanting (minimum 55-60°F for most crops)

⚠️ Zone 9a Challenges

⚠️Summer heat in South
⚠️Fog in coastal areas
⚠️Rare freezes

✅ Best Plants for Zone 9a

✓Citrus
✓Avocados with protection
✓Tropical vegetables
✓Palms

❄️ Winter in Zone 9a

Mild winters with rare light freezes to 20°F-25°F.

☀️ Summer in Zone 9a

Warm to hot summers depending on region. Very long growing season.

🔥 Heat Management for AHS Zone 7-10

This zone experiences 61 to 90 heat days per year with moderate to high heat stress.

🌡️Deep mulching
🌡️Morning watering
🌡️Shade structures
🌡️Heat-tolerant varieties

Source: American Horticultural Society

📊 Park's Whopper Quick Facts

Days to Maturity
65-75
Difficulty
beginner
Season
summer
Type
F1

📍 View Park's Whopper Guide for Other Zones

Zone 1aZone 1bZone 2aZone 2bZone 3aZone 3bZone 4aZone 4bZone 5aZone 5bZone 6aZone 6bZone 7aZone 7bZone 8aZone 8bZone 9aZone 9bZone 10aZone 10bZone 11aZone 11bZone 12aZone 12bZone 13aZone 13b

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