Mc Kinnon, WY frost dates
Last spring frostMay 22median date
First fall frostSep 29median date
Growing season130 daysfrost-free
Hardiness zone5bZone 5b
How Mc Kinnon compares
- In 8 years out of 10, the last spring frost in Mc Kinnon falls between May 4 and June 11, a 38-day window. The first fall frost falls between September 15 and October 14.
- The median last frost is 1 day later than the Wyoming median of May 21.
- Its 130-day growing season is longer than 59% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 21 days later than the zone 5b median of May 1. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5b chart.
- The weather station records an average of 190 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 4 |
| 50% (median) | May 22 |
| 10% (safe for tender plants) | June 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 15 |
| 50% (median) | September 29 |
| 90% (late) | October 14 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Mc Kinnon, WY
Mc Kinnon, WY frost dates — last frost May 22, first frost Sep 29, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Feb 27 to Mar 13Transplant outside: Apr 24 to May 8
Start indoors: Mar 13 to Mar 27Transplant outside: Jun 5 to Jun 19
Start indoors: Mar 13 to Mar 27Transplant outside: Jun 5 to Jun 19
Start indoors: Mar 27 to Apr 10Transplant outside: May 29 to Jun 12
Start indoors: Mar 27 to Apr 10Transplant outside: May 1 to May 15Sow outdoors: Apr 24 to May 29Plant for fall: Aug 4 to Sep 1
Start indoors: Mar 27 to Apr 10Transplant outside: Apr 24 to May 8Sow outdoors: Apr 24 to May 8Plant for fall: Jul 21 to Aug 11
Start indoors: Mar 27 to Apr 10Transplant outside: May 8 to May 22Plant for fall: Jun 23 to Jul 14
Start indoors: Mar 27 to Apr 10Transplant outside: May 1 to May 15Plant for fall: Jun 23 to Jul 14
Start indoors: Mar 27 to Apr 10Transplant outside: May 8 to May 22Plant for fall: Jun 23 to Jul 14
Start indoors: Apr 10 to Apr 24Transplant outside: Jun 12 to Jun 26Sow outdoors: Jun 12 to Jun 26
Start indoors: Apr 10 to Apr 24Transplant outside: May 29 to Jun 12
Sow outdoors: Apr 10 to May 1Plant for fall: Jul 7 to Jul 28
Sow outdoors: Apr 10 to May 1Plant for fall: Aug 4 to Aug 25
Sow outdoors: Apr 17 to May 29Plant for fall: Aug 18 to Sep 8
Start indoors: Apr 24 to May 1Transplant outside: Jun 5 to Jun 12Sow outdoors: May 29 to Jun 12Plant for fall: Jul 14 to Jul 28
Start indoors: Apr 24 to May 1Sow outdoors: May 29 to Jun 12Plant for fall: Jul 21 to Aug 4
Start indoors: Apr 24 to May 1Sow outdoors: May 29 to Jun 12
Start indoors: Apr 24 to May 1Transplant outside: Jun 5 to Jun 19
Sow outdoors: May 1 to May 29Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 1 to May 29Plant for fall: Jul 21 to Aug 4
Sow outdoors: May 1 to May 22
Sow outdoors: May 8 to Jun 5Plant for fall: Jul 21 to Aug 4
Sow outdoors: May 8 to May 29Plant for fall: Aug 4 to Aug 25
Sow outdoors: May 29 to Jun 19Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 29 to Jun 12
Transplant outside: Jun 5 to Jun 26
Plant for fall: Sep 15 to Oct 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mc Kinnon, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 27 – Mar 13 | Apr 24 – May 8 | — | — |
| Peppers | Mar 13 – Mar 27 | Jun 5 – Jun 19 | — | — |
| Eggplant | Mar 13 – Mar 27 | Jun 5 – Jun 19 | — | — |
| Tomatoes | Mar 27 – Apr 10 | May 29 – Jun 12 | — | — |
| Lettuce | Mar 27 – Apr 10 | May 1 – May 15 | Apr 24 – May 29 | Aug 4 – Sep 1 |
| Kale | Mar 27 – Apr 10 | Apr 24 – May 8 | Apr 24 – May 8 | Jul 21 – Aug 11 |
| Broccoli | Mar 27 – Apr 10 | May 8 – May 22 | — | Jun 23 – Jul 14 |
| Cabbage | Mar 27 – Apr 10 | May 1 – May 15 | — | Jun 23 – Jul 14 |
| Cauliflower | Mar 27 – Apr 10 | May 8 – May 22 | — | Jun 23 – Jul 14 |
| Okra | Apr 10 – Apr 24 | Jun 12 – Jun 26 | Jun 12 – Jun 26 | — |
| Basil | Apr 10 – Apr 24 | May 29 – Jun 12 | — | — |
| Peas | — | — | Apr 10 – May 1 | Jul 7 – Jul 28 |
| Spinach | — | — | Apr 10 – May 1 | Aug 4 – Aug 25 |
| Radishes | — | — | Apr 17 – May 29 | Aug 18 – Sep 8 |
| Cucumbers | Apr 24 – May 1 | Jun 5 – Jun 12 | May 29 – Jun 12 | Jul 14 – Jul 28 |
| Zucchini & Summer Squash | Apr 24 – May 1 | — | May 29 – Jun 12 | Jul 21 – Aug 4 |
| Winter Squash & Pumpkins | Apr 24 – May 1 | — | May 29 – Jun 12 | — |
| Melons & Watermelon | Apr 24 – May 1 | Jun 5 – Jun 19 | — | — |
| Carrots | — | — | May 1 – May 29 | Jul 7 – Jul 21 |
| Beets | — | — | May 1 – May 29 | Jul 21 – Aug 4 |
| Potatoes | — | — | May 1 – May 22 | — |
| Swiss Chard | — | — | May 8 – Jun 5 | Jul 21 – Aug 4 |
| Cilantro | — | — | May 8 – May 29 | Aug 4 – Aug 25 |
| Green Beans | — | — | May 29 – Jun 19 | Jul 14 – Jul 28 |
| Sweet Corn | — | — | May 29 – Jun 12 | — |
| Sweet Potatoes | — | Jun 5 – Jun 26 | — | — |
| Garlic | — | — | — | Sep 15 – Oct 20 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Manila, UT weather station, 14 km away (elevation 6,394 ft (1,949 m)).
Frost dates near Mc Kinnon
- Lonetree Jun 14 · Sep 9
- Mountain View Jun 14 · Sep 9
- Lyman Jun 14 · Sep 9
- Fort Bridger Jun 14 · Sep 9
- Robertson Jun 14 · Sep 9
- Little America May 25 · Sep 27
- Granger May 25 · Sep 27
- Green River May 24 · Sep 22
- Rock Springs May 24 · Sep 24
- Opal frost any month
Frequently asked questions
When is the last frost in Mc Kinnon, WY?
The median last spring frost in Mc Kinnon, WY is May 22. There is still about a 10% chance of frost after June 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Mc Kinnon, WY?
The median first fall frost is September 29, with about a 10% chance of frost before September 15.
How long is the growing season in Mc Kinnon, WY?
About 130 days between the median last spring frost and first fall frost.
What planting zone is Mc Kinnon, WY?
Mc Kinnon, WY is in USDA hardiness zone 5b.