Frost Dates for Beaverton, OR 97078
Beaverton has 6 ZIP codes. The Beaverton, OR frost page lists all of them with their dates.
Last spring frost April 15 · First fall frost October 29 · 197 frost-free days · USDA Zone 8b
ZIP 97078 has about 25,700 people, one of 6 ZIP codes in Beaverton.
Long season: 197 frost-free days. Spring frost risk spans March 21–May 10 (50 days). Fall frost risk spans October 7–November 20 (44 days).
Frost probability for 97078
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 10 | April 15 | March 21 |
| Fall (first frost) | October 7 | October 29 | November 20 |
Dates come from NOAA 1971–2000 freeze probabilities at N WILLAMETTE EXP STN (24.2 km away); the 50% date is the median year.
Which crops fit a 197-day season in Beaverton
In Beaverton (197 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Mar 11 | Apr 29–May 6 | 155 | fits: 80 days to maturity, 155 available after Apr 29. | Jun 29 |
| Pepper | Mar 4 | Apr 29–May 6 | 155 | fits: 75 days to maturity, 155 available after Apr 29. | Jul 4 |
| Lettuce | Feb 18 | Mar 18–Mar 25 | 232 | two-plantings: Plant Mar 18 and again by Sep 7; both mature before Nov 5. | Sep 7 |
| Carrots | — | Mar 25–Apr 1 | 239 | fits: 70 days to maturity, 239 available after Mar 25. | Aug 27 |
| Cucumber | Mar 25 | Apr 29–May 6 | 169 | two-plantings: Plant Apr 29 and again by Aug 2; both mature before Oct 15. | Aug 2 |
| Beans | — | Apr 22–May 6 | 183 | two-plantings: Plant Apr 22 and again by Aug 9; both mature before Oct 22. | Aug 9 |
| Peas | — | Feb 18–Apr 29 | 260 | fits: 65 days to maturity, 260 available after Feb 18. | Aug 18 |
| Zucchini | Apr 1 | Apr 29–May 6 | 169 | two-plantings: Plant Apr 29 and again by Aug 7; both mature before Oct 15. | Aug 7 |
| Onion | Jan 21 | Mar 18–Apr 1 | 232 | fits: 100 days to maturity, 232 available after Mar 18. | — |
| Spinach | — | Feb 18–Apr 8 | 274 | two-plantings: Plant Feb 18 and again by Sep 26; both mature before Nov 19. | Sep 26 |
| Kale | Feb 4 | Mar 18–Apr 1 | 246 | two-plantings: Plant Mar 18 and again by Sep 11; both mature before Nov 19. | Sep 11 |
| Broccoli | Feb 18 | Mar 18–Apr 1 | 232 | fits: 80 days to maturity, 232 available after Mar 18. | Aug 3 |
| Cabbage | Feb 18 | Mar 18–Apr 1 | 246 | fits: 70 days to maturity, 246 available after Mar 18. | Aug 27 |
| Radish | — | Feb 18–May 13 | 260 | two-plantings: Plant Feb 18 and again by Sep 27; both mature before Nov 5. | Sep 27 |
| Beets | — | Feb 18–May 13 | 260 | two-plantings: Plant Feb 18 and again by Aug 28; both mature before Nov 5. | Aug 28 |
| Potatoes | — | Apr 1–Apr 8 | 218 | fits: 90 days to maturity, 218 available after Apr 1. | — |
| Garlic | — | Oct 29 | 302 | overwinter: Plant Oct 29 to Nov 19; harvest the following summer. | Nov 19 |
| Strawberry | — | Mar 11–May 6 | 253 | perennial: A perennial: plant Mar 11; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 18 | Apr 22–Apr 29 | 169 | fits: 75 days to maturity, 169 available after Apr 22. | Jul 11 |
| Pumpkin | Apr 1 | Apr 29–Apr 29 | 162 | fits: 100 days to maturity, 162 available after Apr 29. | Jun 16 |
| Cauliflower | Mar 4 | Apr 8–Apr 22 | 211 | fits: 75 days to maturity, 211 available after Apr 8. | Aug 8 |
| Swiss Chard | Feb 18 | Apr 1–Apr 1 | 218 | two-plantings: Plant Apr 1 and again by Aug 28; both mature before Nov 5. | Aug 28 |
| Arugula | — | Feb 18–May 13 | 274 | two-plantings: Plant Feb 18 and again by Sep 26; both mature before Nov 19. | Sep 26 |
| Brussel Sprouts | Feb 18 | Mar 18–Apr 1 | 246 | fits: 100 days to maturity, 246 available after Mar 18. | Jul 28 |
| Butternut Squash | Apr 1 | Apr 29–May 6 | 162 | fits: 100 days to maturity, 162 available after Apr 29. | Jun 16 |
| Eggplant | Feb 25 | Apr 29–May 6 | 155 | fits: 70 days to maturity, 155 available after Apr 29. | Jul 9 |
| Okra | Mar 18 | Apr 22–Apr 29 | 176 | two-plantings: Plant Apr 22 and again by Aug 7; both mature before Oct 15. | Aug 7 |
| Basil | Mar 11 | May 6–May 6 | 162 | two-plantings: Plant May 6 and again by Aug 2; both mature before Oct 15. | Aug 2 |
| Cilantro | — | Mar 18–Apr 8 | 232 | two-plantings: Plant Mar 18 and again by Sep 2; both mature before Nov 5. | Sep 2 |
| Parsley | Feb 4 | Apr 22–Apr 29 | 197 | fits: 70 days to maturity, 197 available after Apr 22. | Aug 13 |
| Celery | Feb 4 | Apr 22–May 6 | 197 | fits: 120 days to maturity, 197 available after Apr 22. | Jun 24 |
| Scallions | Feb 4 | Mar 18–Apr 1 | 246 | two-plantings: Plant Mar 18 and again by Sep 6; both mature before Nov 19. | Sep 6 |
| Turnip | — | Mar 18–Apr 1 | 246 | two-plantings: Plant Mar 18 and again by Sep 16; both mature before Nov 19. | Sep 16 |
| Kohlrabi | — | Mar 4–Mar 18 | 260 | two-plantings: Plant Mar 4 and again by Sep 11; both mature before Nov 19. | Sep 11 |
| Bok Choy | Mar 18 | Apr 8–Apr 15 | 211 | two-plantings: Plant Apr 8 and again by Sep 7; both mature before Nov 5. | Sep 7 |
| Collards | Feb 4 | Mar 18–Apr 1 | 246 | two-plantings: Plant Mar 18 and again by Sep 6; both mature before Nov 19. | Sep 6 |
| Cantaloupe | Apr 1 | Apr 29–May 6 | 155 | fits: 85 days to maturity, 155 available after Apr 29. | Jun 24 |
| Chives | Jan 21 | Apr 22–Apr 29 | 211 | fits: 90 days to maturity, 211 available after Apr 22. | — |
| Dill | — | Feb 18–May 13 | 260 | two-plantings: Plant Feb 18 and again by Aug 28; both mature before Nov 5. | Aug 28 |
| Oregano | Feb 4 | Apr 22–Apr 29 | 211 | fits: 80 days to maturity, 211 available after Apr 22. | — |
| Rosemary | Jan 21 | Apr 22–Apr 29 | 197 | fits: 80 days to maturity, 197 available after Apr 22. | — |
| Sage | Feb 18 | Apr 22–Apr 29 | 211 | fits: 75 days to maturity, 211 available after Apr 22. | — |
| Thyme | Feb 4 | Apr 22–Apr 29 | 211 | fits: 90 days to maturity, 211 available after Apr 22. | — |
| Calendula | Mar 4 | Apr 1–Apr 15 | 218 | two-plantings: Plant Apr 1 and again by Sep 2; both mature before Nov 5. | Sep 2 |
| Cosmos | Mar 18 | Apr 15–Apr 29 | 183 | two-plantings: Plant Apr 15 and again by Aug 2; both mature before Oct 15. | Aug 2 |
| Lavender | Jan 21 | Apr 15–Apr 29 | 218 | fits: 90 days to maturity, 218 available after Apr 15. | — |
| Marigolds | Mar 4 | Apr 15–Apr 22 | 183 | two-plantings: Plant Apr 15 and again by Aug 12; both mature before Oct 15. | Aug 12 |
| Melons | Apr 1 | Apr 29–May 6 | 155 | fits: 85 days to maturity, 155 available after Apr 29. | Jun 24 |
| Mint | — | Apr 15–Apr 29 | 218 | fits: 90 days to maturity, 218 available after Apr 15. | — |
| Nasturtiums | Mar 18 | Apr 15–Apr 22 | 183 | two-plantings: Plant Apr 15 and again by Aug 7; both mature before Oct 15. | Aug 7 |
| Pole Beans | — | Apr 22–May 6 | 176 | fits: 65 days to maturity, 176 available after Apr 22. | Jul 28 |
| Spaghetti Squash | Apr 1 | Apr 29–May 6 | 162 | fits: 90 days to maturity, 162 available after Apr 29. | Jun 26 |
| Sunflowers | — | Apr 15–Apr 29 | 183 | fits: 70 days to maturity, 183 available after Apr 15. | Jul 23 |
| Tomatillos | Feb 18 | Apr 22–Apr 29 | 162 | fits: 75 days to maturity, 162 available after Apr 22. | Jul 4 |
| Watermelon | Apr 1 | Apr 22–Apr 29 | 162 | fits: 80 days to maturity, 162 available after Apr 22. | Jun 29 |
| Yellow Squash | Apr 1 | Apr 29–May 6 | 169 | two-plantings: Plant Apr 29 and again by Aug 7; both mature before Oct 15. | Aug 7 |
| Zinnias | Mar 18 | Apr 15–Apr 29 | 183 | two-plantings: Plant Apr 15 and again by Aug 2; both mature before Oct 15. | Aug 2 |
Month by month in Beaverton
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 21), Lavender (Jan 21), Onion (Jan 21), Rosemary (Jan 21). |
| February | Start indoors: Celery (Feb 4), Collards (Feb 4), Kale (Feb 4), Oregano (Feb 4), Parsley (Feb 4), Scallions (Feb 4), +9 more. Direct sow from: Arugula (Feb 18), Beets (Feb 18), Dill (Feb 18), Peas (Feb 18), Radish (Feb 18), Spinach (Feb 18). |
| March | Start indoors: Calendula (Mar 4), Cauliflower (Mar 4), Marigolds (Mar 4), Pepper (Mar 4), Basil (Mar 11), Tomato (Mar 11), +7 more. Direct sow from: Kohlrabi (Mar 4), Cilantro (Mar 18), Turnip (Mar 18), Carrots (Mar 25). Transplant from: Broccoli (Mar 18), Brussel Sprouts (Mar 18), Cabbage (Mar 18), Collards (Mar 18), Kale (Mar 18), Lettuce (Mar 18), +2 more. Plant: Strawberry (Mar 11). |
| April | Start indoors: Butternut Squash (Apr 1), Cantaloupe (Apr 1), Melons (Apr 1), Pumpkin (Apr 1), Spaghetti Squash (Apr 1), Watermelon (Apr 1), +2 more. Direct sow from: Potatoes (Apr 1), Sunflowers (Apr 15), Beans (Apr 22), Pole Beans (Apr 22). Transplant from: Calendula (Apr 1), Swiss Chard (Apr 1), Bok Choy (Apr 8), Cauliflower (Apr 8), Cosmos (Apr 15), Lavender (Apr 15), +26 more. Last frost around April 15. |
| May | Transplant from: Basil (May 6). |
| June | Last sowing dates: Butternut Squash (Jun 16), Pumpkin (Jun 16), Cantaloupe (Jun 24), Celery (Jun 24), Melons (Jun 24), Spaghetti Squash (Jun 26), +2 more. |
| July | Last sowing dates: Pepper (Jul 4), Tomatillos (Jul 4), Eggplant (Jul 9), Corn (Jul 11), Sunflowers (Jul 23), Brussel Sprouts (Jul 28), +1 more. |
| August | Last sowing dates: Basil (Aug 2), Cosmos (Aug 2), Cucumber (Aug 2), Zinnias (Aug 2), Broccoli (Aug 3), Nasturtiums (Aug 7), +13 more. |
| September | Last sowing dates: Calendula (Sep 2), Cilantro (Sep 2), Collards (Sep 6), Scallions (Sep 6), Bok Choy (Sep 7), Lettuce (Sep 7), +6 more. |
| October | Direct sow from: Garlic (Oct 29). First frost around October 29. |
| November | Last sowing dates: Garlic (Nov 19). |
| 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 Beaverton, OR (ZIP 97078)?
The median last spring frost date for Beaverton, OR (ZIP code 97078) is around April 15. 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 March 21; one in ten it runs past May 10.
What is the first fall frost date in Beaverton, OR?
The median first fall frost date for Beaverton, OR is around October 29. 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 October 7 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Beaverton, OR?
The frost-free growing season in Beaverton is about 197 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 Beaverton (197 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Beaverton, OR?
Beaverton, OR is in USDA hardiness zone 8b (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 Beaverton, OR?
Start tomatoes indoors Mar 11 and plant out Apr 29 in Beaverton. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Beaverton?
Two: plant Mar 18 and again by Sep 7; both mature before Nov 5.
When do I plant garlic in Beaverton?
Oct 29 to Nov 19; it overwinters and is ready the following summer.
Can I get two tomato crops in Beaverton?
Yes: plant out Apr 29 for a summer crop, and set out a second round of transplants by Jun 29 for a fall crop.
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