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    California Seed Zones

    Metadata Updated: July 23, 2025

    California seed zone boundaries were first proposed in 1946, revised, and published as a joint report between the U.S. Forest Service and CAL FIRE in 1970. The 85 seed zones are defined by major areas in California having similar climatic, topographic, and soil conditions. These are areas where plant materials can be moved or transferred with minimal risk of being poorly adapted to a new location. Each seed zone is labelled by a three-digit identifier that reflects the layer’s creation. The first digit indicates the physiographic and climatic region. The second digit gives the subregion, which captures the next lower level of environmental changes known to affect growth and adaptability of plants. The last digit denotes the subzone. Subzones are limited to about 50 miles in latitude and further refine the uniformity of environment within each subregion. Where possible, boundaries follow natural or physical features. For more information, see the original publication: https://www.fs.usda.gov/research/treesearch/41438.

    Access & Use Information

    Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: See this page for license information.

    Downloads & Resources

    Dates

    Metadata Created Date November 27, 2024
    Metadata Updated Date July 23, 2025

    Metadata Source

    Harvested from State of California

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 27, 2024
    Metadata Updated Date July 23, 2025
    Publisher CAL FIRE
    Maintainer
    Identifier 0826ce91-c2e9-4d89-b500-62653e327773
    Data First Published 2019-04-08T22:52:44.000Z
    Data Last Modified 2023-12-13T20:51:13.883Z
    Category Fire, Natural Resources
    Public Access Level public
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id d48def77-c975-4e74-952b-cb65356b52e3
    Harvest Source Id 3ba8a0c1-5dc2-4897-940f-81922d3cf8bc
    Harvest Source Title State of California
    License http://www.opendefinition.org/licenses/cc-by
    Source Datajson Identifier True
    Source Hash 54fb16207338a8278419385f0b972dcccc7903887ba793c4a8ee4a44b3f28465
    Source Schema Version 1.1

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