Frost Dates for Prineville, OR 97754
Last spring frost July 5 · First fall frost August 23 · 49 frost-free days · USDA Zone 6b
ZIP 97754 has about 23,000 people.
Short season: 49 frost-free days. Spring frost risk spans June 17–July 23 (36 days). Fall frost risk spans August 3–September 11 (39 days).
Frost probability for 97754
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | July 23 | July 5 | June 17 |
| Fall (first frost) | August 3 | August 23 | September 11 |
Dates come from NOAA 1971–2000 freeze probabilities at OCHOCO RS (30.1 km away); the 50% date is the median year.
Which crops fit a 49-day season in Prineville
In Prineville (49 frost-free days, a short season), 16 of 56 planner crops fit outright, 3 get two plantings, 10 need an indoor start, 1 need a faster variety, 25 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | May 31 | Jul 19–Jul 26 | 7 | no-fit: Needs 80 days; Prineville has 7 after Jul 19. | — |
| Pepper | May 24 | Jul 19–Jul 26 | 7 | no-fit: Needs 75 days; Prineville has 7 after Jul 19. | — |
| Lettuce | May 10 | Jun 7–Jun 14 | 84 | fits: 45 days to maturity, 84 available after Jun 7. | Jul 2 |
| Carrots | — | Jun 14–Jun 21 | 91 | fits: 70 days to maturity, 91 available after Jun 14. | Jun 21 |
| Cucumber | Jun 14 | Jul 19–Jul 26 | 21 | no-fit: Needs 60 days; Prineville has 21 after Jul 19. | — |
| Beans | — | Jul 12–Jul 26 | 35 | no-fit: Needs 60 days; Prineville has 35 after Jul 12. | — |
| Peas | — | May 10–Jul 19 | 112 | fits: 65 days to maturity, 112 available after May 10. | Jun 12 |
| Zucchini | Jun 21 | Jul 19–Jul 26 | 21 | no-fit: Needs 55 days; Prineville has 21 after Jul 19. | — |
| Onion | Apr 12 | Jun 7–Jun 21 | 84 | head-start: Even planted out Jun 7, the outdoor season is about 16 days short; choose an early variety or grow under cover. | — |
| Spinach | — | May 10–Jun 28 | 126 | two-plantings: Plant May 10 and again by Jul 21; both mature before Sep 13. | Jul 21 |
| Kale | Apr 26 | Jun 7–Jun 21 | 98 | fits: 55 days to maturity, 98 available after Jun 7. | Jul 6 |
| Broccoli | May 10 | Jun 7–Jun 21 | 84 | fits: 80 days to maturity, 84 available after Jun 7. | — |
| Cabbage | May 10 | Jun 7–Jun 21 | 98 | fits: 70 days to maturity, 98 available after Jun 7. | Jun 21 |
| Radish | — | May 10–Aug 2 | 112 | two-plantings: Plant May 10 and again by Jul 22; both mature before Aug 30. | Jul 22 |
| Beets | — | May 10–Aug 2 | 112 | fits: 55 days to maturity, 112 available after May 10. | Jun 22 |
| Potatoes | — | Jun 21–Jun 28 | 70 | tight: Direct-sow only; pick a variety under 70 days. | — |
| Garlic | — | Aug 23 | 154 | overwinter: Plant Aug 23 to Sep 13; harvest the following summer. | Sep 13 |
| Strawberry | — | May 31–Jul 26 | 105 | perennial: A perennial: plant May 31; it fruits from the following year and keeps producing for several years. | — |
| Corn | Jun 7 | Jul 12–Jul 19 | 21 | no-fit: Needs 75 days; Prineville has 21 after Jul 12. | — |
| Pumpkin | Jun 21 | Jul 19–Jul 19 | 14 | no-fit: Needs 100 days; Prineville has 14 after Jul 19. | — |
| Cauliflower | May 24 | Jun 28–Jul 12 | 63 | head-start: Even planted out Jun 28, the outdoor season is about 12 days short; choose an early variety or grow under cover. | — |
| Swiss Chard | May 10 | Jun 21–Jun 21 | 70 | fits: 55 days to maturity, 70 available after Jun 21. | Jun 22 |
| Arugula | — | May 10–Aug 2 | 126 | two-plantings: Plant May 10 and again by Jul 21; both mature before Sep 13. | Jul 21 |
| Brussel Sprouts | May 10 | Jun 7–Jun 21 | 98 | head-start: Even planted out Jun 7, the outdoor season is about 2 days short; choose an early variety or grow under cover. | — |
| Butternut Squash | Jun 21 | Jul 19–Jul 26 | 14 | no-fit: Needs 100 days; Prineville has 14 after Jul 19. | — |
| Eggplant | May 17 | Jul 19–Jul 26 | 7 | no-fit: Needs 70 days; Prineville has 7 after Jul 19. | — |
| Okra | Jun 7 | Jul 12–Jul 19 | 28 | no-fit: Needs 55 days; Prineville has 28 after Jul 12. | — |
| Basil | May 31 | Jul 26–Jul 26 | 14 | no-fit: Needs 60 days; Prineville has 14 after Jul 26. | — |
| Cilantro | — | Jun 7–Jun 28 | 84 | fits: 50 days to maturity, 84 available after Jun 7. | Jun 27 |
| Parsley | Apr 26 | Jul 12–Jul 19 | 49 | head-start: Even planted out Jul 12, the outdoor season is about 21 days short; choose an early variety or grow under cover. | — |
| Celery | Apr 26 | Jul 12–Jul 26 | 49 | no-fit: Needs 120 days; Prineville has 49 after Jul 12. | — |
| Scallions | Apr 26 | Jun 7–Jun 21 | 98 | fits: 60 days to maturity, 98 available after Jun 7. | Jul 1 |
| Turnip | — | Jun 7–Jun 21 | 98 | fits: 50 days to maturity, 98 available after Jun 7. | Jul 11 |
| Kohlrabi | — | May 24–Jun 7 | 112 | fits: 55 days to maturity, 112 available after May 24. | Jul 6 |
| Bok Choy | Jun 7 | Jun 28–Jul 5 | 63 | fits: 45 days to maturity, 63 available after Jun 28. | Jul 2 |
| Collards | Apr 26 | Jun 7–Jun 21 | 98 | fits: 60 days to maturity, 98 available after Jun 7. | Jul 1 |
| Cantaloupe | Jun 21 | Jul 19–Jul 26 | 7 | no-fit: Needs 85 days; Prineville has 7 after Jul 19. | — |
| Chives | Apr 12 | Jul 12–Jul 19 | 63 | no-fit: Needs 90 days; Prineville has 63 after Jul 12. | — |
| Dill | — | May 10–Aug 2 | 112 | fits: 55 days to maturity, 112 available after May 10. | Jun 22 |
| Oregano | Apr 26 | Jul 12–Jul 19 | 63 | head-start: Even planted out Jul 12, the outdoor season is about 17 days short; choose an early variety or grow under cover. | — |
| Rosemary | Apr 12 | Jul 12–Jul 19 | 49 | no-fit: Needs 80 days; Prineville has 49 after Jul 12. | — |
| Sage | May 10 | Jul 12–Jul 19 | 63 | head-start: Even planted out Jul 12, the outdoor season is about 12 days short; choose an early variety or grow under cover. | — |
| Thyme | Apr 26 | Jul 12–Jul 19 | 63 | no-fit: Needs 90 days; Prineville has 63 after Jul 12. | — |
| Calendula | May 24 | Jun 21–Jul 5 | 70 | fits: 50 days to maturity, 70 available after Jun 21. | Jun 27 |
| Cosmos | Jun 7 | Jul 5–Jul 19 | 35 | no-fit: Needs 60 days; Prineville has 35 after Jul 5. | — |
| Lavender | Apr 12 | Jul 5–Jul 19 | 70 | head-start: Even planted out Jul 5, the outdoor season is about 20 days short; choose an early variety or grow under cover. | — |
| Marigolds | May 24 | Jul 5–Jul 12 | 35 | head-start: Even planted out Jul 5, the outdoor season is about 15 days short; choose an early variety or grow under cover. | — |
| Melons | Jun 21 | Jul 19–Jul 26 | 7 | no-fit: Needs 85 days; Prineville has 7 after Jul 19. | — |
| Mint | — | Jul 5–Jul 19 | 70 | head-start: Even planted out Jul 5, the outdoor season is about 20 days short; choose an early variety or grow under cover. | — |
| Nasturtiums | Jun 7 | Jul 5–Jul 12 | 35 | head-start: Even planted out Jul 5, the outdoor season is about 20 days short; choose an early variety or grow under cover. | — |
| Pole Beans | — | Jul 12–Jul 26 | 28 | no-fit: Needs 65 days; Prineville has 28 after Jul 12. | — |
| Spaghetti Squash | Jun 21 | Jul 19–Jul 26 | 14 | no-fit: Needs 90 days; Prineville has 14 after Jul 19. | — |
| Sunflowers | — | Jul 5–Jul 19 | 35 | no-fit: Needs 70 days; Prineville has 35 after Jul 5. | — |
| Tomatillos | May 10 | Jul 12–Jul 19 | 14 | no-fit: Needs 75 days; Prineville has 14 after Jul 12. | — |
| Watermelon | Jun 21 | Jul 12–Jul 19 | 14 | no-fit: Needs 80 days; Prineville has 14 after Jul 12. | — |
| Yellow Squash | Jun 21 | Jul 19–Jul 26 | 21 | no-fit: Needs 55 days; Prineville has 21 after Jul 19. | — |
| Zinnias | Jun 7 | Jul 5–Jul 19 | 35 | no-fit: Needs 60 days; Prineville has 35 after Jul 5. | — |
Month by month in Prineville
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost). |
| March | Organize planting supplies and seed-starting mix. Check stored garden tools. |
| April | Start indoors: Chives (Apr 12), Lavender (Apr 12), Onion (Apr 12), Rosemary (Apr 12), Celery (Apr 26), Collards (Apr 26), +5 more. |
| May | Start indoors: Broccoli (May 10), Brussel Sprouts (May 10), Cabbage (May 10), Lettuce (May 10), Sage (May 10), Swiss Chard (May 10), +8 more. Direct sow from: Arugula (May 10), Beets (May 10), Dill (May 10), Peas (May 10), Radish (May 10), Spinach (May 10), +1 more. Plant: Strawberry (May 31). |
| June | Start indoors: Bok Choy (Jun 7), Corn (Jun 7), Cosmos (Jun 7), Nasturtiums (Jun 7), Okra (Jun 7), Zinnias (Jun 7), +9 more. Direct sow from: Cilantro (Jun 7), Turnip (Jun 7), Carrots (Jun 14), Potatoes (Jun 21). Transplant from: Broccoli (Jun 7), Brussel Sprouts (Jun 7), Cabbage (Jun 7), Collards (Jun 7), Kale (Jun 7), Lettuce (Jun 7), +6 more. Last sowing dates: Peas (Jun 12), Cabbage (Jun 21), Carrots (Jun 21), Beets (Jun 22), Dill (Jun 22), Swiss Chard (Jun 22), +2 more. |
| July | Direct sow from: Sunflowers (Jul 5), Beans (Jul 12), Pole Beans (Jul 12). Transplant from: Cosmos (Jul 5), Lavender (Jul 5), Marigolds (Jul 5), Mint (Jul 5), Nasturtiums (Jul 5), Zinnias (Jul 5), +23 more. Last frost around July 5. Last sowing dates: Collards (Jul 1), Scallions (Jul 1), Bok Choy (Jul 2), Lettuce (Jul 2), Kale (Jul 6), Kohlrabi (Jul 6), +4 more. |
| August | Direct sow from: Garlic (Aug 23). First frost around August 23. |
| September | Last sowing dates: Garlic (Sep 13). |
| October | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Prineville, OR (ZIP 97754)?
The median last spring frost date for Prineville, OR (ZIP code 97754) is around July 5. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before June 17; one in ten it runs past July 23.
What is the first fall frost date in Prineville, OR?
The median first fall frost date for Prineville, OR is around August 23. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around August 3 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Prineville, OR?
The frost-free growing season in Prineville is about 49 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Prineville (49 frost-free days, a short season), 16 of 56 planner crops fit outright, 3 get two plantings, 10 need an indoor start, 1 need a faster variety, 25 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Prineville, OR?
Prineville, OR is in USDA hardiness zone 6b (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Prineville, OR?
Start tomatoes indoors May 31 and plant out Jul 19 in Prineville. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Prineville?
One spring planting around Jun 7. The last sow date is Jul 2.
When do I plant garlic in Prineville?
Aug 23 to Sep 13; it overwinters and is ready the following summer.
Can I grow Celery in Prineville?
Not reliably outdoors. Needs 120 days; Prineville has 49 after Jul 12.
Which nearby ZIP has a longer season?
Bend (ZIP 97701) has 75 frost-free days, 26 more than Prineville (ZIP 97754). See Bend ZIP 97701 frost dates
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- When to plant in OR
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