Monthly CNDDB Data Download

The CNDDB and accompanying GIS data are updated and processed monthly for distribution to subscribers. The Spotted Owl Observations Database is continually updated and processed periodically for distribution to subscribers. All CNDDB subscribers may download these updates. Access to the download site is password controlled; see below for password information. CNDDB and Spotted Owl dataset components have been compressed into separate, self-executing files. Subscribers with computers running Windows® may use these files to update their CNDDB and Spotted Owl data.

link opens in new tab or windowUpdates to the CNDDB GIS Data, October 2019 (PDF)

Jump to link opens in new tab or windowSubscriber Downloads, or read instructions

All uses of data from the CNDDB are subject to the terms and conditions contained in our link opens in new tab or windowLicense Agreement (PDF).


Data updates and CNDDB password changes will occur every month on the first Tuesday of the month or the next business day if the Tuesday is a holiday. If you are a subscriber and need login information, please contact BDB Information Services at (916) 324-3812.

Data Last Updated: December 3, 2019

2019 Update Schedule

  • October 1
  • November 5
  • December 3

2020 Update Schedule

  • January 7
  • February 4
  • March 3
  • April 7
  • May 5
  • June 2
  • July 7
  • August 4
  • September 1
  • October 6
  • November 3
  • December 1

Read these instructions before proceeding

  1. On the dates shown above, current CNDDB subscribers will receive a new Password via email. If you do not receive an email, please contact BDB Information Services at (916) 324-3812 to obtain the current Password.
  2. In a web browser, navigate to the CNDDB Subscriber's Data Updates web page, where you will login to download the data updates.
  3. On the Data Updates web page, you will need to login using the User Name and Password that you were given (see Step 1 to obtain password).
    The User Name will be either:
    • cnddb_com (for commercial subscribers); or
    • cnddb_gov (for government subscribers).
  4. Once you have access to the server, you will see the files gis_gov.exe (or gis_com.exe) and spowl_db.exe.
    • The gis_*.exe file contains the CNDDB GIS data for users of ArcGis Desktop or other GIS applications.
    • The spowl_db.exe file the California Spotted Owl Database, which can be used with GIS software and/or database applications.
  5. To download, simply click on one of the files, and then click on "Save." A pop-up window should appear, prompting you to select a location to which to save the file. Navigate to your Windows Desktop , and then click "Save." The file will be downloaded and saved to your Desktop. Proceed with the remaining files, downloading them as needed.
  6. Once you have downloaded the files to your Desktop, you can run them to extract the data. Double-clicking on the gis_*.exe file or the spowl_db.exe file will cause the compressed data to be extracted to a folder of your choice, where the data is then available for use.