Granite Canon, WY frost dates
Last spring frostMay 31median date
First fall frostSep 19median date
Growing season111 daysfrost-free
Hardiness zone5bZone 5b
How Granite Canon compares
- In 8 years out of 10, the last spring frost in Granite Canon falls between May 17 and June 15, a 29-day window. The first fall frost falls between September 5 and October 1.
- The median last frost is 10 days later than the Wyoming median of May 21.
- Its 111-day growing season is longer than 23% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 30 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 203 nights a year at or below 32°F.
- Compared with Cheyenne, WY, 32 km away, the last frost here is 19 days later than there and the growing season is 31 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 17 |
| 50% (median) | May 31 |
| 10% (safe for tender plants) | June 15 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 5 |
| 50% (median) | September 19 |
| 90% (late) | October 1 |
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 Granite Canon, WY
Granite Canon, WY frost dates — last frost May 31, first frost Sep 19, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Mar 8 to Mar 22Transplant outside: May 3 to May 17
Start indoors: Mar 22 to Apr 5Transplant outside: Jun 14 to Jun 28
Start indoors: Mar 22 to Apr 5Transplant outside: Jun 14 to Jun 28
Start indoors: Apr 5 to Apr 19Transplant outside: Jun 7 to Jun 21
Start indoors: Apr 5 to Apr 19Transplant outside: May 10 to May 24Sow outdoors: May 3 to Jun 7Plant for fall: Jul 25 to Aug 22
Start indoors: Apr 5 to Apr 19Transplant outside: May 3 to May 17Sow outdoors: May 3 to May 17Plant for fall: Jul 11 to Aug 1
Start indoors: Apr 5 to Apr 19Transplant outside: May 17 to May 31
Start indoors: Apr 5 to Apr 19Transplant outside: May 10 to May 24
Start indoors: Apr 5 to Apr 19Transplant outside: May 17 to May 31
Start indoors: Apr 19 to May 3Transplant outside: Jun 21 to Jul 5Sow outdoors: Jun 21 to Jul 5
Start indoors: Apr 19 to May 3Transplant outside: Jun 7 to Jun 21
Sow outdoors: Apr 19 to May 10Plant for fall: Jun 27 to Jul 18
Sow outdoors: Apr 19 to May 10Plant for fall: Jul 25 to Aug 15
Sow outdoors: Apr 26 to Jun 7Plant for fall: Aug 8 to Aug 29
Start indoors: May 3 to May 10Transplant outside: Jun 14 to Jun 21Sow outdoors: Jun 7 to Jun 21
Start indoors: May 3 to May 10Sow outdoors: Jun 7 to Jun 21Plant for fall: Jul 11 to Jul 25
Start indoors: May 3 to May 10Sow outdoors: Jun 7 to Jun 21
Start indoors: May 3 to May 10Transplant outside: Jun 14 to Jun 28
Sow outdoors: May 10 to Jun 7Plant for fall: Jun 27 to Jul 11
Sow outdoors: May 10 to Jun 7Plant for fall: Jul 11 to Jul 25
Sow outdoors: May 10 to May 31
Sow outdoors: May 17 to Jun 14Plant for fall: Jul 11 to Jul 25
Sow outdoors: May 17 to Jun 7Plant for fall: Jul 25 to Aug 15
Sow outdoors: Jun 7 to Jun 28
Sow outdoors: Jun 7 to Jun 21
Transplant outside: Jun 14 to Jul 5
Plant for fall: Sep 5 to Oct 10
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Granite Canon, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 8 – Mar 22 | May 3 – May 17 | — | — |
| Peppers | Mar 22 – Apr 5 | Jun 14 – Jun 28 | — | — |
| Eggplant | Mar 22 – Apr 5 | Jun 14 – Jun 28 | — | — |
| Tomatoes | Apr 5 – Apr 19 | Jun 7 – Jun 21 | — | — |
| Lettuce | Apr 5 – Apr 19 | May 10 – May 24 | May 3 – Jun 7 | Jul 25 – Aug 22 |
| Kale | Apr 5 – Apr 19 | May 3 – May 17 | May 3 – May 17 | Jul 11 – Aug 1 |
| Broccoli | Apr 5 – Apr 19 | May 17 – May 31 | — | — |
| Cabbage | Apr 5 – Apr 19 | May 10 – May 24 | — | — |
| Cauliflower | Apr 5 – Apr 19 | May 17 – May 31 | — | — |
| Okra | Apr 19 – May 3 | Jun 21 – Jul 5 | Jun 21 – Jul 5 | — |
| Basil | Apr 19 – May 3 | Jun 7 – Jun 21 | — | — |
| Peas | — | — | Apr 19 – May 10 | Jun 27 – Jul 18 |
| Spinach | — | — | Apr 19 – May 10 | Jul 25 – Aug 15 |
| Radishes | — | — | Apr 26 – Jun 7 | Aug 8 – Aug 29 |
| Cucumbers | May 3 – May 10 | Jun 14 – Jun 21 | Jun 7 – Jun 21 | — |
| Zucchini & Summer Squash | May 3 – May 10 | — | Jun 7 – Jun 21 | Jul 11 – Jul 25 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 111 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 3 – May 10 | — | Jun 7 – Jun 21 | — |
| Melons & Watermelon | May 3 – May 10 | Jun 14 – Jun 28 | — | — |
| Carrots | — | — | May 10 – Jun 7 | Jun 27 – Jul 11 |
| Beets | — | — | May 10 – Jun 7 | Jul 11 – Jul 25 |
| Potatoes | — | — | May 10 – May 31 | — |
| Swiss Chard | — | — | May 17 – Jun 14 | Jul 11 – Jul 25 |
| Cilantro | — | — | May 17 – Jun 7 | Jul 25 – Aug 15 |
| Green Beans | — | — | Jun 7 – Jun 28 | — |
| Sweet Corn | — | — | Jun 7 – Jun 21 | — |
| Sweet Potatoes Warning: Your frost-free season is about 111 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 14 – Jul 5 | — | — |
| Garlic | — | — | — | Sep 5 – Oct 10 |
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 Virginia Dale 7 Ene, CO weather station, 11 km away (elevation 7,014 ft (2,138 m)).
Frost dates near Granite Canon
- Buford May 27 · Sep 19
- Tie Siding May 31 · Sep 19
- Fe Warren Afb May 14 · Oct 1
- Cheyenne May 12 · Oct 1
- Horse Creek May 27 · Sep 19
- Laramie Jun 7 · Sep 4
- Hillsdale May 21 · Sep 24
- Bosler Jun 7 · Sep 4
- Burns May 16 · Sep 27
- Jelm frost any month
Frequently asked questions
When is the last frost in Granite Canon, WY?
The median last spring frost in Granite Canon, WY is May 31. There is still about a 10% chance of frost after June 15, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Granite Canon, WY?
The median first fall frost is September 19, with about a 10% chance of frost before September 5.
How long is the growing season in Granite Canon, WY?
About 111 days between the median last spring frost and first fall frost.
What planting zone is Granite Canon, WY?
Granite Canon, WY is in USDA hardiness zone 5b.