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Johnson County

Frequently Asked Lawn and Garden Questions

Questions? Boy, do we get questions!

Many times your question is not unique, or problem new. It is often  a similar concern for other gardeners.

In this sections you will find short answers to many of the more common issues faced by others. If you cannot find the answer you’re looking for be sure to let us know.

Gardening Hotline

The Johnson County Extension Master Gardener Hotline is available to answer your gardening questions:

Diseases Miscellaneous
Flowers Roses
Fruits Soils
House Plants Trees/Shrubs
Insects Vegetables
Lawns Weeds

Average Frost Free Dates for Johnson County, Kansas


Percentage Chance of Frost
(32 degrees F)
50/50 Chance April 15 (Average last frost date)
40% April 18
30% April 21
20% April 25
10% April 30
5% May 4
1% May 13
  • Earliest date of last frost was March 15, 1910.
  • Latest date of last frost was May 14, 1914.


Percentage Chance of Frost
(32 degrees F)
50/50 Chance October 23 (Average first frost date)
40% October 20
30% October 17
20% October 13
10% October 9
5% October 5
1% September 29
  • Earliest date of first frost was September 24, 1942.
  • Latest date of first frost was November 11, 1946.


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Contact Us

Please direct all gardening questions to our Garden Hotline, staffed by trained Extension Master Gardener volunteers who will assist you with your questions.

Phone: (913) 715-7050

Email: garden.help@jocogov.org