Lander, WY frost dates
Last spring frostMay 18median date
First fall frostSep 27median date
Growing season132 daysfrost-free
Hardiness zone5aZone 5a
How Lander compares
- In 8 years out of 10, the last spring frost in Lander falls between May 4 and June 3, a 30-day window. The first fall frost falls between September 13 and October 10.
- The median last frost is 3 days earlier than the Wyoming median of May 21.
- Its 132-day growing season is longer than 62% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 15 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 180 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 4 |
| 50% (median) | May 18 |
| 10% (safe for tender plants) | June 3 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 13 |
| 50% (median) | September 27 |
| 90% (late) | October 10 |
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 Lander, WY
Lander, WY frost dates — last frost May 18, first frost Sep 27, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 20 to May 4
Start indoors: Mar 9 to Mar 23Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 9 to Mar 23Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 23 to Apr 6Transplant outside: May 25 to Jun 8
Start indoors: Mar 23 to Apr 6Transplant outside: Apr 27 to May 11Sow outdoors: Apr 20 to May 25Plant for fall: Aug 2 to Aug 30
Start indoors: Mar 23 to Apr 6Transplant outside: Apr 20 to May 4Sow outdoors: Apr 20 to May 4Plant for fall: Jul 19 to Aug 9
Start indoors: Mar 23 to Apr 6Transplant outside: May 4 to May 18Plant for fall: Jun 21 to Jul 12
Start indoors: Mar 23 to Apr 6Transplant outside: Apr 27 to May 11Plant for fall: Jun 21 to Jul 12
Start indoors: Mar 23 to Apr 6Transplant outside: May 4 to May 18Plant for fall: Jun 21 to Jul 12
Start indoors: Apr 6 to Apr 20Transplant outside: Jun 8 to Jun 22Sow outdoors: Jun 8 to Jun 22
Start indoors: Apr 6 to Apr 20Transplant outside: May 25 to Jun 8
Sow outdoors: Apr 6 to Apr 27Plant for fall: Jul 5 to Jul 26
Sow outdoors: Apr 6 to Apr 27Plant for fall: Aug 2 to Aug 23
Sow outdoors: Apr 13 to May 25Plant for fall: Aug 16 to Sep 6
Start indoors: Apr 20 to Apr 27Transplant outside: Jun 1 to Jun 8Sow outdoors: May 25 to Jun 8Plant for fall: Jul 12 to Jul 26
Start indoors: Apr 20 to Apr 27Sow outdoors: May 25 to Jun 8Plant for fall: Jul 19 to Aug 2
Start indoors: Apr 20 to Apr 27Sow outdoors: May 25 to Jun 8
Start indoors: Apr 20 to Apr 27Transplant outside: Jun 1 to Jun 15
Sow outdoors: Apr 27 to May 25Plant for fall: Jul 5 to Jul 19
Sow outdoors: Apr 27 to May 25Plant for fall: Jul 19 to Aug 2
Sow outdoors: Apr 27 to May 18
Sow outdoors: May 4 to Jun 1Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 4 to May 25Plant for fall: Aug 2 to Aug 23
Sow outdoors: May 25 to Jun 15Plant for fall: Jul 12 to Jul 26
Sow outdoors: May 25 to Jun 8
Transplant outside: Jun 1 to Jun 22
Plant for fall: Sep 13 to Oct 18
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Lander, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 23 – Mar 9 | Apr 20 – May 4 | — | — |
| Peppers | Mar 9 – Mar 23 | Jun 1 – Jun 15 | — | — |
| Eggplant | Mar 9 – Mar 23 | Jun 1 – Jun 15 | — | — |
| Tomatoes | Mar 23 – Apr 6 | May 25 – Jun 8 | — | — |
| Lettuce | Mar 23 – Apr 6 | Apr 27 – May 11 | Apr 20 – May 25 | Aug 2 – Aug 30 |
| Kale | Mar 23 – Apr 6 | Apr 20 – May 4 | Apr 20 – May 4 | Jul 19 – Aug 9 |
| Broccoli | Mar 23 – Apr 6 | May 4 – May 18 | — | Jun 21 – Jul 12 |
| Cabbage | Mar 23 – Apr 6 | Apr 27 – May 11 | — | Jun 21 – Jul 12 |
| Cauliflower | Mar 23 – Apr 6 | May 4 – May 18 | — | Jun 21 – Jul 12 |
| Okra | Apr 6 – Apr 20 | Jun 8 – Jun 22 | Jun 8 – Jun 22 | — |
| Basil | Apr 6 – Apr 20 | May 25 – Jun 8 | — | — |
| Peas | — | — | Apr 6 – Apr 27 | Jul 5 – Jul 26 |
| Spinach | — | — | Apr 6 – Apr 27 | Aug 2 – Aug 23 |
| Radishes | — | — | Apr 13 – May 25 | Aug 16 – Sep 6 |
| Cucumbers | Apr 20 – Apr 27 | Jun 1 – Jun 8 | May 25 – Jun 8 | Jul 12 – Jul 26 |
| Zucchini & Summer Squash | Apr 20 – Apr 27 | — | May 25 – Jun 8 | Jul 19 – Aug 2 |
| Winter Squash & Pumpkins | Apr 20 – Apr 27 | — | May 25 – Jun 8 | — |
| Melons & Watermelon | Apr 20 – Apr 27 | Jun 1 – Jun 15 | — | — |
| Carrots | — | — | Apr 27 – May 25 | Jul 5 – Jul 19 |
| Beets | — | — | Apr 27 – May 25 | Jul 19 – Aug 2 |
| Potatoes | — | — | Apr 27 – May 18 | — |
| Swiss Chard | — | — | May 4 – Jun 1 | Jul 19 – Aug 2 |
| Cilantro | — | — | May 4 – May 25 | Aug 2 – Aug 23 |
| Green Beans | — | — | May 25 – Jun 15 | Jul 12 – Jul 26 |
| Sweet Corn | — | — | May 25 – Jun 8 | — |
| Sweet Potatoes | — | Jun 1 – Jun 22 | — | — |
| Garlic | — | — | — | Sep 13 – Oct 18 |
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 Lander Hunt Fld Ap, WY weather station, 16 km away (elevation 5,591 ft (1,704 m)).
Frost dates near Lander
- Hudson May 18 · Sep 27
- Arapahoe May 16 · Sep 28
- Saint Stephens May 12 · Sep 24
- Fort Washakie May 18 · Sep 27
- Riverton May 12 · Sep 24
- Kinnear May 21 · Sep 20
- Pavillion May 14 · Sep 30
- Shoshoni May 7 · Oct 3
- Jeffrey City Jun 1 · Sep 13
- Crowheart Jun 1 · Sep 14
Frequently asked questions
When is the last frost in Lander, WY?
The median last spring frost in Lander, WY is May 18. There is still about a 10% chance of frost after June 3, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Lander, WY?
The median first fall frost is September 27, with about a 10% chance of frost before September 13.
How long is the growing season in Lander, WY?
About 132 days between the median last spring frost and first fall frost.
What planting zone is Lander, WY?
Lander, WY is in USDA hardiness zone 5a.