California · West
Ontario, CA
Zone-aware planting reference for Ontario. Population 171,214; USDA hardiness zone 10a; nearest curated zip code 91758.
- USDA zone
- 10a
- Population
- 171,214
- Last spring frost
- 01/04
- First fall frost
- 12/30
- Growing season
- 365 days
- Nearest zip
- 91758
Local timing baseline
Detailed guidance for this section is being prepared. Check back soon.
Crops suited to Ontario
Crops whose USDA zone range includes zone 10a. 28 crops match.
Tree fruit
12 crops
Berries
3 crops
Nuts
1 crop
Vegetables
10 crops
Herbs
2 crops
Other cities in California
Frequently asked questions
- What USDA zone is Ontario, CA?
Ontario sits in USDA hardiness zone 10a, based on the nearest zip code (91758).
- When are the average last and first frost dates in Ontario?
Based on the nearest weather station, Ontario averages a last spring frost around 01/04 and a first fall frost around 12/30, for a growing season of about 365 days.
- What crops grow well in Ontario?
28 crops in the ZonePlant database have a recommended USDA zone range that includes zone 10a. Tree fruit, berries, and most common vegetables are well-suited; check each crop page for variety-level guidance.
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