Laramie, WY planting zone & frost dates
Laramie is in USDA hardiness zone 4a. The last spring frost usually comes around June 7 and the first fall frost around September 4, for a growing season of about 88 days.
Planting calendar for Laramie
Dates are counted from the average last spring frost (June 7) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Apr 12 – Apr 26 Transplant outdoors: Jun 14 – Jun 21 |
| Peppers | Start seeds indoors: Mar 29 – Apr 12 Transplant outdoors: Jun 21 – Jun 28 |
| Eggplant | Start seeds indoors: Mar 29 – Apr 12 Transplant outdoors: Jun 21 – Jun 28 |
| Broccoli | Start seeds indoors: Mar 29 – Apr 12 Transplant outdoors: May 10 – May 24 |
| Cabbage | Start seeds indoors: Mar 29 – Apr 12 Transplant outdoors: May 10 – May 24 |
| Onions (sets) | Plant outdoors: May 10 – May 24 |
| Peas | Sow outdoors: Apr 26 – May 10 |
| Spinach | Sow outdoors: Apr 26 – May 10 |
| Lettuce | Sow outdoors: May 10 – May 24 |
| Carrots | Sow outdoors: May 10 – May 24 |
| Potatoes | Plant outdoors: May 10 – May 24 |
| Beans | Sow outdoors: Jun 14 – Jun 21 |
| Sweet corn | Sow outdoors: Jun 14 – Jun 21 |
| Cucumbers | Sow outdoors: Jun 14 – Jun 21 |
| Squash & zucchini | Sow outdoors: Jun 14 – Jun 21 |
| Basil | Start seeds indoors: Apr 26 – May 10 Transplant outdoors: Jun 14 – Jun 21 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Jul 10 (8 weeks before the average first fall frost on Sep 4).
Useful for zone 4a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Cold frame / mini greenhouse — adds weeks to a short season
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | May 23 | Jun 7 | Jun 29 |
| First 32°F frost in fall is before | Sep 18 | Sep 4 | Aug 17 |
How to read it: in spring there is a 10% chance of a frost after June 29, so that is a safe date for tender plants. In fall there is a 10% chance of frost before August 17. A hard freeze (28°F) usually ends around May 22.
Hardiness zone by ZIP code in Laramie
- 82070 zone 4b
- 82072 zone 4a
- 82073 zone 5b
Nearby cities
Questions
What growing zone is Laramie, WY?
Laramie is in USDA Plant Hardiness Zone 4a (average extreme winter low -30°F to -25°F), according to the USDA 2023 map. Some ZIP codes of the city fall in zones 4b, 5b.
When is the last frost in Laramie?
The average last spring frost (32°F) in Laramie is June 7. There is still a 10% chance of frost until June 29.
When can I plant tomatoes in Laramie?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Jun 14 – Jun 21. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Laramie 2 Nw, WY (USC00485435), 3.4 km (2.1 mi) from the city center, elevation 2176 m, based on 18 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.