Frost Dates for Coos Bay, OR 97420
Last spring frost April 2 · First fall frost November 16 · 228 frost-free days · USDA Zone 9a
ZIP 97420 has about 27,600 people.
Long season: 228 frost-free days. Spring frost risk spans February 26–May 4 (67 days). Fall frost risk spans October 15–December 19 (65 days).
Frost probability for 97420
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 4 | April 2 | February 26 |
| Fall (first frost) | October 15 | November 16 | December 19 |
Dates come from NOAA 1971–2000 freeze probabilities at BANDON 2 NNE (32.4 km away); the 50% date is the median year.
Which crops fit a 228-day season in Coos Bay
In Coos Bay (228 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 | Feb 26 | Apr 16–Apr 23 | 186 | fits: 80 days to maturity, 186 available after Apr 16. | Jul 17 |
| Pepper | Feb 19 | Apr 16–Apr 23 | 186 | fits: 75 days to maturity, 186 available after Apr 16. | Jul 22 |
| Lettuce | Feb 5 | Mar 5–Mar 12 | 263 | two-plantings: Plant Mar 5 and again by Sep 25; both mature before Nov 23. | Sep 25 |
| Carrots | — | Mar 12–Mar 19 | 270 | fits: 70 days to maturity, 270 available after Mar 12. | Sep 14 |
| Cucumber | Mar 12 | Apr 16–Apr 23 | 200 | two-plantings: Plant Apr 16 and again by Aug 20; both mature before Nov 2. | Aug 20 |
| Beans | — | Apr 9–Apr 23 | 214 | two-plantings: Plant Apr 9 and again by Aug 27; both mature before Nov 9. | Aug 27 |
| Peas | — | Feb 5–Apr 16 | 291 | fits: 65 days to maturity, 291 available after Feb 5. | Sep 5 |
| Zucchini | Mar 19 | Apr 16–Apr 23 | 200 | two-plantings: Plant Apr 16 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Onion | Jan 8 | Mar 5–Mar 19 | 263 | fits: 100 days to maturity, 263 available after Mar 5. | — |
| Spinach | — | Feb 5–Mar 26 | 305 | two-plantings: Plant Feb 5 and again by Oct 14; both mature before Dec 7. | Oct 14 |
| Kale | Jan 22 | Mar 5–Mar 19 | 277 | two-plantings: Plant Mar 5 and again by Sep 29; both mature before Dec 7. | Sep 29 |
| Broccoli | Feb 5 | Mar 5–Mar 19 | 263 | fits: 80 days to maturity, 263 available after Mar 5. | Aug 21 |
| Cabbage | Feb 5 | Mar 5–Mar 19 | 277 | fits: 70 days to maturity, 277 available after Mar 5. | Sep 14 |
| Radish | — | Feb 5–Apr 30 | 291 | two-plantings: Plant Feb 5 and again by Oct 15; both mature before Nov 23. | Oct 15 |
| Beets | — | Feb 5–Apr 30 | 291 | two-plantings: Plant Feb 5 and again by Sep 15; both mature before Nov 23. | Sep 15 |
| Potatoes | — | Mar 19–Mar 26 | 249 | fits: 90 days to maturity, 249 available after Mar 19. | — |
| Garlic | — | Nov 16 | 333 | overwinter: Plant Nov 16 to Dec 7; harvest the following summer. | Dec 7 |
| Strawberry | — | Feb 26–Apr 23 | 284 | perennial: A perennial: plant Feb 26; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 5 | Apr 9–Apr 16 | 200 | fits: 75 days to maturity, 200 available after Apr 9. | Jul 29 |
| Pumpkin | Mar 19 | Apr 16–Apr 16 | 193 | fits: 100 days to maturity, 193 available after Apr 16. | Jul 4 |
| Cauliflower | Feb 19 | Mar 26–Apr 9 | 242 | fits: 75 days to maturity, 242 available after Mar 26. | Aug 26 |
| Swiss Chard | Feb 5 | Mar 19–Mar 19 | 249 | two-plantings: Plant Mar 19 and again by Sep 15; both mature before Nov 23. | Sep 15 |
| Arugula | — | Feb 5–Apr 30 | 305 | two-plantings: Plant Feb 5 and again by Oct 14; both mature before Dec 7. | Oct 14 |
| Brussel Sprouts | Feb 5 | Mar 5–Mar 19 | 277 | fits: 100 days to maturity, 277 available after Mar 5. | Aug 15 |
| Butternut Squash | Mar 19 | Apr 16–Apr 23 | 193 | fits: 100 days to maturity, 193 available after Apr 16. | Jul 4 |
| Eggplant | Feb 12 | Apr 16–Apr 23 | 186 | fits: 70 days to maturity, 186 available after Apr 16. | Jul 27 |
| Okra | Mar 5 | Apr 9–Apr 16 | 207 | two-plantings: Plant Apr 9 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Basil | Feb 26 | Apr 23–Apr 23 | 193 | two-plantings: Plant Apr 23 and again by Aug 20; both mature before Nov 2. | Aug 20 |
| Cilantro | — | Mar 5–Mar 26 | 263 | two-plantings: Plant Mar 5 and again by Sep 20; both mature before Nov 23. | Sep 20 |
| Parsley | Jan 22 | Apr 9–Apr 16 | 228 | fits: 70 days to maturity, 228 available after Apr 9. | Aug 31 |
| Celery | Jan 22 | Apr 9–Apr 23 | 228 | fits: 120 days to maturity, 228 available after Apr 9. | Jul 12 |
| Scallions | Jan 22 | Mar 5–Mar 19 | 277 | two-plantings: Plant Mar 5 and again by Sep 24; both mature before Dec 7. | Sep 24 |
| Turnip | — | Mar 5–Mar 19 | 277 | two-plantings: Plant Mar 5 and again by Oct 4; both mature before Dec 7. | Oct 4 |
| Kohlrabi | — | Feb 19–Mar 5 | 291 | two-plantings: Plant Feb 19 and again by Sep 29; both mature before Dec 7. | Sep 29 |
| Bok Choy | Mar 5 | Mar 26–Apr 2 | 242 | two-plantings: Plant Mar 26 and again by Sep 25; both mature before Nov 23. | Sep 25 |
| Collards | Jan 22 | Mar 5–Mar 19 | 277 | two-plantings: Plant Mar 5 and again by Sep 24; both mature before Dec 7. | Sep 24 |
| Cantaloupe | Mar 19 | Apr 16–Apr 23 | 186 | fits: 85 days to maturity, 186 available after Apr 16. | Jul 12 |
| Chives | Jan 8 | Apr 9–Apr 16 | 242 | fits: 90 days to maturity, 242 available after Apr 9. | — |
| Dill | — | Feb 5–Apr 30 | 291 | two-plantings: Plant Feb 5 and again by Sep 15; both mature before Nov 23. | Sep 15 |
| Oregano | Jan 22 | Apr 9–Apr 16 | 242 | fits: 80 days to maturity, 242 available after Apr 9. | — |
| Rosemary | Jan 8 | Apr 9–Apr 16 | 228 | fits: 80 days to maturity, 228 available after Apr 9. | — |
| Sage | Feb 5 | Apr 9–Apr 16 | 242 | fits: 75 days to maturity, 242 available after Apr 9. | — |
| Thyme | Jan 22 | Apr 9–Apr 16 | 242 | fits: 90 days to maturity, 242 available after Apr 9. | — |
| Calendula | Feb 19 | Mar 19–Apr 2 | 249 | two-plantings: Plant Mar 19 and again by Sep 20; both mature before Nov 23. | Sep 20 |
| Cosmos | Mar 5 | Apr 2–Apr 16 | 214 | two-plantings: Plant Apr 2 and again by Aug 20; both mature before Nov 2. | Aug 20 |
| Lavender | Jan 8 | Apr 2–Apr 16 | 249 | fits: 90 days to maturity, 249 available after Apr 2. | — |
| Marigolds | Feb 19 | Apr 2–Apr 9 | 214 | two-plantings: Plant Apr 2 and again by Aug 30; both mature before Nov 2. | Aug 30 |
| Melons | Mar 19 | Apr 16–Apr 23 | 186 | fits: 85 days to maturity, 186 available after Apr 16. | Jul 12 |
| Mint | — | Apr 2–Apr 16 | 249 | fits: 90 days to maturity, 249 available after Apr 2. | — |
| Nasturtiums | Mar 5 | Apr 2–Apr 9 | 214 | two-plantings: Plant Apr 2 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Pole Beans | — | Apr 9–Apr 23 | 207 | fits: 65 days to maturity, 207 available after Apr 9. | Aug 15 |
| Spaghetti Squash | Mar 19 | Apr 16–Apr 23 | 193 | fits: 90 days to maturity, 193 available after Apr 16. | Jul 14 |
| Sunflowers | — | Apr 2–Apr 16 | 214 | fits: 70 days to maturity, 214 available after Apr 2. | Aug 10 |
| Tomatillos | Feb 5 | Apr 9–Apr 16 | 193 | fits: 75 days to maturity, 193 available after Apr 9. | Jul 22 |
| Watermelon | Mar 19 | Apr 9–Apr 16 | 193 | fits: 80 days to maturity, 193 available after Apr 9. | Jul 17 |
| Yellow Squash | Mar 19 | Apr 16–Apr 23 | 200 | two-plantings: Plant Apr 16 and again by Aug 25; both mature before Nov 2. | Aug 25 |
| Zinnias | Mar 5 | Apr 2–Apr 16 | 214 | two-plantings: Plant Apr 2 and again by Aug 20; both mature before Nov 2. | Aug 20 |
Month by month in Coos Bay
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 8), Lavender (Jan 8), Onion (Jan 8), Rosemary (Jan 8), Celery (Jan 22), Collards (Jan 22), +5 more. |
| February | Start indoors: Broccoli (Feb 5), Brussel Sprouts (Feb 5), Cabbage (Feb 5), Lettuce (Feb 5), Sage (Feb 5), Swiss Chard (Feb 5), +8 more. Direct sow from: Arugula (Feb 5), Beets (Feb 5), Dill (Feb 5), Peas (Feb 5), Radish (Feb 5), Spinach (Feb 5), +1 more. Plant: Strawberry (Feb 26). |
| March | Start indoors: Bok Choy (Mar 5), Corn (Mar 5), Cosmos (Mar 5), Nasturtiums (Mar 5), Okra (Mar 5), Zinnias (Mar 5), +9 more. Direct sow from: Cilantro (Mar 5), Turnip (Mar 5), Carrots (Mar 12), Potatoes (Mar 19). Transplant from: Broccoli (Mar 5), Brussel Sprouts (Mar 5), Cabbage (Mar 5), Collards (Mar 5), Kale (Mar 5), Lettuce (Mar 5), +6 more. |
| April | Direct sow from: Sunflowers (Apr 2), Beans (Apr 9), Pole Beans (Apr 9). Transplant from: Cosmos (Apr 2), Lavender (Apr 2), Marigolds (Apr 2), Mint (Apr 2), Nasturtiums (Apr 2), Zinnias (Apr 2), +23 more. Last frost around April 2. |
| May | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| June | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| July | Last sowing dates: Butternut Squash (Jul 4), Pumpkin (Jul 4), Cantaloupe (Jul 12), Celery (Jul 12), Melons (Jul 12), Spaghetti Squash (Jul 14), +6 more. |
| August | Last sowing dates: Sunflowers (Aug 10), Brussel Sprouts (Aug 15), Pole Beans (Aug 15), Basil (Aug 20), Cosmos (Aug 20), Cucumber (Aug 20), +10 more. |
| September | Last sowing dates: Peas (Sep 5), Cabbage (Sep 14), Carrots (Sep 14), Beets (Sep 15), Dill (Sep 15), Swiss Chard (Sep 15), +8 more. |
| October | Last sowing dates: Turnip (Oct 4), Arugula (Oct 14), Spinach (Oct 14), Radish (Oct 15). |
| November | Direct sow from: Garlic (Nov 16). First frost around November 16. |
| December | Last sowing dates: Garlic (Dec 7). |
Frequently Asked Questions
What is the last frost date for Coos Bay, OR (ZIP 97420)?
The median last spring frost date for Coos Bay, OR (ZIP code 97420) is around April 2. 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 February 26; one in ten it runs past May 4.
What is the first fall frost date in Coos Bay, OR?
The median first fall frost date for Coos Bay, OR is around November 16. 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 15 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Coos Bay, OR?
The frost-free growing season in Coos Bay is about 228 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 Coos Bay (228 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 Coos Bay, OR?
Coos Bay, OR is in USDA hardiness zone 9a (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 Coos Bay, OR?
Start tomatoes indoors Feb 26 and plant out Apr 16 in Coos Bay. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Coos Bay?
Two: plant Mar 5 and again by Sep 25; both mature before Nov 23.
When do I plant garlic in Coos Bay?
Nov 16 to Dec 7; it overwinters and is ready the following summer.
Can I get two tomato crops in Coos Bay?
Yes: plant out Apr 16 for a summer crop, and set out a second round of transplants by Jul 17 for a fall crop.
Which nearby ZIP has a longer season?
Florence (ZIP 97439) has 236 frost-free days, 8 more than Coos Bay (ZIP 97420). See Florence ZIP 97439 frost dates
Nearby and related
- Frost dates for North Bend, OR 97459 (9.5 mi)
- Frost dates for Roseburg, OR 97471 (33 mi)
- Frost dates for Sutherlin, OR 97479 (46 mi)
- Frost dates for Myrtle Creek, OR 97457 (48.8 mi)
- Frost dates for Florence, OR 97439 (49.6 mi)
- When to plant in OR
- When to plant Peppers in OR
- When to plant Cucumbers in OR
- When to plant Zucchini in OR
- When to plant Butternut Squash in OR
- When to plant Basil in OR
- When to plant Sweet Corn in OR
- Look up another ZIP