What Grows in Casper, WY?
Casper in central Wyoming has a harsh semi-arid continental climate demanding tough gardening approaches.
Zone
Last frost
First frost
Frost-free days
Casper is in USDA Zone 4b with about 118 frost-free days, and you can grow potatoes, beets, carrots, kale, and more here.
Planting tips for Casper
Harsh continental climate. Cold-hardy only. Row covers essential. Short season demands focus.
What to plant, and when
Timing by your frost dates — last frost May 18, first frost September 12.
Tomato, Cherry Tomato, Bell Pepper, Chili Pepper, Cucumber, Zucchini, Pumpkin, Basil
Lettuce, Spinach, Kale, Broccoli, Carrot, Radish, Beets, Onion
Green Beans, Potato, Corn, Microgreens, Rhubarb, Mint
Garlic
What grows well in Casper
Tomato
Grows well
Cherry Tomato
Grows well
Bell Pepper
Grows well
Chili Pepper
Grows well
Cucumber
Grows well
Zucchini
Grows well
Green Beans
Grows well
Lettuce
Grows well
Spinach
Grows well
Kale
Grows well
Broccoli
Grows well
Carrot
Grows well
Radish
Grows well
Beets
Grows well
Onion
Grows well
Garlic
Grows well
Potato
Grows well
Corn
Grows well
Peas
Grows well
Cabbage
Grows well
Brussels Sprouts
Grows well
Swiss Chard
Grows well
Arugula
Grows well
Microgreens
Grows well
Pumpkin
Grows well
Leek
Grows well
Asparagus
Grows well
Rhubarb
Grows well
Basil
Grows well
Mint
Grows wellBorderline — needs extra care
Frequently asked questions
What hardiness zone is Casper, WY in?
Casper, WY is in USDA Hardiness Zone 4b. This drives everything about what you can reliably grow — it maps directly to how cold your winters get.
When is the last frost in Casper?
The average last spring frost in Casper is around May 18, and the first fall frost is typically September 12. Plan to move tender plants outside after May 18 and have them harvested (or protected) before September 12.
What grows well in Casper?
Plenty — Casper's USDA Zone 4b climate supports 30+ crops. Some of the easiest and most reliable here are Cherry Tomato, Chili Pepper, Cucumber.
How long is Casper's growing season?
Casper typically has around 118 frost-free days per year (roughly May 18 to September 12). That's enough for most annual vegetables if you start warm-season crops indoors and stick to faster-maturing varieties for anything tender.
What should I plant first in Casper?
Go with fast-maturing crops to get a quick win while the season is short: Microgreens, Arugula, Radish are among the quickest from seed to harvest in Casper.
Can I grow vegetables in containers in Casper?
Yes — Casper's climate is container-friendly for the right crops. Tomato, Cherry Tomato, Bell Pepper all do well in pots, which also lets you start them a little earlier and move them in on cold nights.
When should I start seeds indoors in Casper?
For warm-season crops like Tomato, Cherry Tomato, Bell Pepper, start seeds indoors 6–8 weeks before your last frost (around May 18), then transplant after the danger of frost has passed.
What's tricky to grow in Casper?
A few crops need extra care in Casper's climate — Collard Greens, Blackberry, Pawpaw are borderline here and may need season extension (row covers, cold frames, or a head start indoors).