Lysite, WY frost dates
Last spring frostMay 14median date
First fall frostOct 3median date
Growing season142 daysfrost-free
Hardiness zone5aZone 5a
How Lysite compares
- In 8 years out of 10, the last spring frost in Lysite falls between April 29 and June 1, a 33-day window. The first fall frost falls between September 20 and October 18.
- The median last frost is 7 days earlier than the Wyoming median of May 21.
- Its 142-day growing season is longer than 83% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 11 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 164 nights a year at or below 32°F.
- Compared with Casper, WY, 119 km away, the last frost here is 4 days later than there and the growing season is the same length.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 29 |
| 50% (median) | May 14 |
| 10% (safe for tender plants) | June 1 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 20 |
| 50% (median) | October 3 |
| 90% (late) | October 18 |
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 Lysite, WY
Lysite, WY frost dates — last frost May 14, first frost Oct 3, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Feb 19 to Mar 5Transplant outside: Apr 16 to Apr 30
Start indoors: Mar 5 to Mar 19Transplant outside: May 28 to Jun 11
Start indoors: Mar 5 to Mar 19Transplant outside: May 28 to Jun 11
Start indoors: Mar 19 to Apr 2Transplant outside: May 21 to Jun 4
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 23 to May 7Sow outdoors: Apr 16 to May 21Plant for fall: Aug 8 to Sep 5
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 16 to Apr 30Sow outdoors: Apr 16 to Apr 30Plant for fall: Jul 25 to Aug 15
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 30 to May 14Plant for fall: Jun 27 to Jul 18
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 23 to May 7Plant for fall: Jun 27 to Jul 18
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 30 to May 14Plant for fall: Jun 27 to Jul 18
Start indoors: Apr 2 to Apr 16Transplant outside: Jun 4 to Jun 18Sow outdoors: Jun 4 to Jun 18
Start indoors: Apr 2 to Apr 16Transplant outside: May 21 to Jun 4
Sow outdoors: Apr 2 to Apr 23Plant for fall: Jul 11 to Aug 1
Sow outdoors: Apr 2 to Apr 23Plant for fall: Aug 8 to Aug 29
Sow outdoors: Apr 9 to May 21Plant for fall: Aug 22 to Sep 12
Start indoors: Apr 16 to Apr 23Transplant outside: May 28 to Jun 4Sow outdoors: May 21 to Jun 4Plant for fall: Jul 18 to Aug 1
Start indoors: Apr 16 to Apr 23Sow outdoors: May 21 to Jun 4Plant for fall: Jul 25 to Aug 8
Start indoors: Apr 16 to Apr 23Sow outdoors: May 21 to Jun 4
Start indoors: Apr 16 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 23 to May 21Plant for fall: Jul 11 to Jul 25
Sow outdoors: Apr 23 to May 21Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 23 to May 14
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 30 to May 21Plant for fall: Aug 8 to Aug 29
Sow outdoors: May 21 to Jun 11Plant for fall: Jul 18 to Aug 1
Sow outdoors: May 21 to Jun 4
Transplant outside: May 28 to Jun 18
Plant for fall: Sep 19 to Oct 24
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Lysite, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 19 – Mar 5 | Apr 16 – Apr 30 | — | — |
| Peppers | Mar 5 – Mar 19 | May 28 – Jun 11 | — | — |
| Eggplant | Mar 5 – Mar 19 | May 28 – Jun 11 | — | — |
| Tomatoes | Mar 19 – Apr 2 | May 21 – Jun 4 | — | — |
| Lettuce | Mar 19 – Apr 2 | Apr 23 – May 7 | Apr 16 – May 21 | Aug 8 – Sep 5 |
| Kale | Mar 19 – Apr 2 | Apr 16 – Apr 30 | Apr 16 – Apr 30 | Jul 25 – Aug 15 |
| Broccoli | Mar 19 – Apr 2 | Apr 30 – May 14 | — | Jun 27 – Jul 18 |
| Cabbage | Mar 19 – Apr 2 | Apr 23 – May 7 | — | Jun 27 – Jul 18 |
| Cauliflower | Mar 19 – Apr 2 | Apr 30 – May 14 | — | Jun 27 – Jul 18 |
| Okra | Apr 2 – Apr 16 | Jun 4 – Jun 18 | Jun 4 – Jun 18 | — |
| Basil | Apr 2 – Apr 16 | May 21 – Jun 4 | — | — |
| Peas | — | — | Apr 2 – Apr 23 | Jul 11 – Aug 1 |
| Spinach | — | — | Apr 2 – Apr 23 | Aug 8 – Aug 29 |
| Radishes | — | — | Apr 9 – May 21 | Aug 22 – Sep 12 |
| Cucumbers | Apr 16 – Apr 23 | May 28 – Jun 4 | May 21 – Jun 4 | Jul 18 – Aug 1 |
| Zucchini & Summer Squash | Apr 16 – Apr 23 | — | May 21 – Jun 4 | Jul 25 – Aug 8 |
| Winter Squash & Pumpkins | Apr 16 – Apr 23 | — | May 21 – Jun 4 | — |
| Melons & Watermelon | Apr 16 – Apr 23 | May 28 – Jun 11 | — | — |
| Carrots | — | — | Apr 23 – May 21 | Jul 11 – Jul 25 |
| Beets | — | — | Apr 23 – May 21 | Jul 25 – Aug 8 |
| Potatoes | — | — | Apr 23 – May 14 | — |
| Swiss Chard | — | — | Apr 30 – May 28 | Jul 25 – Aug 8 |
| Cilantro | — | — | Apr 30 – May 21 | Aug 8 – Aug 29 |
| Green Beans | — | — | May 21 – Jun 11 | Jul 18 – Aug 1 |
| Sweet Corn | — | — | May 21 – Jun 4 | — |
| Sweet Potatoes | — | May 28 – Jun 18 | — | — |
| Garlic | — | — | — | Sep 19 – Oct 24 |
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 Black Mtn, WY weather station, 37 km away (elevation 5,636 ft (1,718 m)).
Frost dates near Lysite
- Hiland May 30 · Sep 22
- Arminto May 30 · Sep 22
- Shoshoni May 7 · Oct 3
- Riverton May 12 · Sep 24
- Powder River May 23 · Sep 20
- Kirby May 24 · Sep 16
- Saint Stephens May 12 · Sep 24
- Natrona May 23 · Sep 20
- Ten Sleep May 10 · Oct 1
- Thermopolis May 24 · Sep 16
Frequently asked questions
When is the last frost in Lysite, WY?
The median last spring frost in Lysite, WY is May 14. There is still about a 10% chance of frost after June 1, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Lysite, WY?
The median first fall frost is October 3, with about a 10% chance of frost before September 20.
How long is the growing season in Lysite, WY?
About 142 days between the median last spring frost and first fall frost.
What planting zone is Lysite, WY?
Lysite, WY is in USDA hardiness zone 5a.