Frost Dates for Anchorage, AK 99507
Anchorage has 11 ZIP codes. The Anchorage, AK frost page lists all of them with their dates.
Last spring frost May 26 · First fall frost September 10 · 107 frost-free days · USDA Zone 5a
ZIP 99507 has about 37,300 people, one of 11 ZIP codes in Anchorage.
Short season: 107 frost-free days. Spring frost risk spans May 10–June 10 (31 days). Fall frost risk spans August 24–September 28 (35 days).
Frost probability for 99507
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 10 | May 26 | May 10 |
| Fall (first frost) | August 24 | September 10 | September 28 |
Dates come from NOAA 1971–2000 freeze probabilities at WASILLA 3 S (46.5 km away); the 50% date is the median year.
Which crops fit a 107-day season in Anchorage
In Anchorage (107 frost-free days, a short season), 29 of 56 planner crops fit outright, 15 get two plantings, 9 need an indoor start, 2 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 21 | Jun 9–Jun 16 | 65 | head-start: Even planted out Jun 9, the outdoor season is about 15 days short; choose an early variety or grow under cover. | — |
| Pepper | Apr 14 | Jun 9–Jun 16 | 65 | head-start: Even planted out Jun 9, the outdoor season is about 10 days short; choose an early variety or grow under cover. | — |
| Lettuce | Mar 31 | Apr 28–May 5 | 142 | two-plantings: Plant Apr 28 and again by Jul 20; both mature before Sep 17. | Jul 20 |
| Carrots | — | May 5–May 12 | 149 | fits: 70 days to maturity, 149 available after May 5. | Jul 9 |
| Cucumber | May 5 | Jun 9–Jun 16 | 79 | fits: 60 days to maturity, 79 available after Jun 9. | Jun 14 |
| Beans | — | Jun 2–Jun 16 | 93 | fits: 60 days to maturity, 93 available after Jun 2. | Jun 21 |
| Peas | — | Mar 31–Jun 9 | 170 | fits: 65 days to maturity, 170 available after Mar 31. | Jun 30 |
| Zucchini | May 12 | Jun 9–Jun 16 | 79 | fits: 55 days to maturity, 79 available after Jun 9. | Jun 19 |
| Onion | Mar 3 | Apr 28–May 12 | 142 | fits: 100 days to maturity, 142 available after Apr 28. | — |
| Spinach | — | Mar 31–May 19 | 184 | two-plantings: Plant Mar 31 and again by Aug 8; both mature before Oct 1. | Aug 8 |
| Kale | Mar 17 | Apr 28–May 12 | 156 | two-plantings: Plant Apr 28 and again by Jul 24; both mature before Oct 1. | Jul 24 |
| Broccoli | Mar 31 | Apr 28–May 12 | 142 | fits: 80 days to maturity, 142 available after Apr 28. | Jun 15 |
| Cabbage | Mar 31 | Apr 28–May 12 | 156 | fits: 70 days to maturity, 156 available after Apr 28. | Jul 9 |
| Radish | — | Mar 31–Jun 23 | 170 | two-plantings: Plant Mar 31 and again by Aug 9; both mature before Sep 17. | Aug 9 |
| Beets | — | Mar 31–Jun 23 | 170 | two-plantings: Plant Mar 31 and again by Jul 10; both mature before Sep 17. | Jul 10 |
| Potatoes | — | May 12–May 19 | 128 | fits: 90 days to maturity, 128 available after May 12. | — |
| Garlic | — | Sep 10 | 212 | overwinter: Plant Sep 10 to Oct 1; harvest the following summer. | Oct 1 |
| Strawberry | — | Apr 21–Jun 16 | 163 | perennial: A perennial: plant Apr 21; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 28 | Jun 2–Jun 9 | 79 | fits: 75 days to maturity, 79 available after Jun 2. | — |
| Pumpkin | May 12 | Jun 9–Jun 9 | 72 | no-fit: Needs 100 days; Anchorage has 72 after Jun 9. | — |
| Cauliflower | Apr 14 | May 19–Jun 2 | 121 | fits: 75 days to maturity, 121 available after May 19. | Jun 20 |
| Swiss Chard | Mar 31 | May 12–May 12 | 128 | two-plantings: Plant May 12 and again by Jul 10; both mature before Sep 17. | Jul 10 |
| Arugula | — | Mar 31–Jun 23 | 184 | two-plantings: Plant Mar 31 and again by Aug 8; both mature before Oct 1. | Aug 8 |
| Brussel Sprouts | Mar 31 | Apr 28–May 12 | 156 | fits: 100 days to maturity, 156 available after Apr 28. | Jun 9 |
| Butternut Squash | May 12 | Jun 9–Jun 16 | 72 | no-fit: Needs 100 days; Anchorage has 72 after Jun 9. | — |
| Eggplant | Apr 7 | Jun 9–Jun 16 | 65 | head-start: Even planted out Jun 9, the outdoor season is about 5 days short; choose an early variety or grow under cover. | — |
| Okra | Apr 28 | Jun 2–Jun 9 | 86 | fits: 55 days to maturity, 86 available after Jun 2. | Jun 19 |
| Basil | Apr 21 | Jun 16–Jun 16 | 72 | fits: 60 days to maturity, 72 available after Jun 16. | — |
| Cilantro | — | Apr 28–May 19 | 142 | two-plantings: Plant Apr 28 and again by Jul 15; both mature before Sep 17. | Jul 15 |
| Parsley | Mar 17 | Jun 2–Jun 9 | 107 | fits: 70 days to maturity, 107 available after Jun 2. | Jun 25 |
| Celery | Mar 17 | Jun 2–Jun 16 | 107 | head-start: Even planted out Jun 2, the outdoor season is about 13 days short; choose an early variety or grow under cover. | — |
| Scallions | Mar 17 | Apr 28–May 12 | 156 | two-plantings: Plant Apr 28 and again by Jul 19; both mature before Oct 1. | Jul 19 |
| Turnip | — | Apr 28–May 12 | 156 | two-plantings: Plant Apr 28 and again by Jul 29; both mature before Oct 1. | Jul 29 |
| Kohlrabi | — | Apr 14–Apr 28 | 170 | two-plantings: Plant Apr 14 and again by Jul 24; both mature before Oct 1. | Jul 24 |
| Bok Choy | Apr 28 | May 19–May 26 | 121 | two-plantings: Plant May 19 and again by Jul 20; both mature before Sep 17. | Jul 20 |
| Collards | Mar 17 | Apr 28–May 12 | 156 | two-plantings: Plant Apr 28 and again by Jul 19; both mature before Oct 1. | Jul 19 |
| Cantaloupe | May 12 | Jun 9–Jun 16 | 65 | head-start: Even planted out Jun 9, the outdoor season is about 20 days short; choose an early variety or grow under cover. | — |
| Chives | Mar 3 | Jun 2–Jun 9 | 121 | fits: 90 days to maturity, 121 available after Jun 2. | — |
| Dill | — | Mar 31–Jun 23 | 170 | two-plantings: Plant Mar 31 and again by Jul 10; both mature before Sep 17. | Jul 10 |
| Oregano | Mar 17 | Jun 2–Jun 9 | 121 | fits: 80 days to maturity, 121 available after Jun 2. | — |
| Rosemary | Mar 3 | Jun 2–Jun 9 | 107 | fits: 80 days to maturity, 107 available after Jun 2. | — |
| Sage | Mar 31 | Jun 2–Jun 9 | 121 | fits: 75 days to maturity, 121 available after Jun 2. | — |
| Thyme | Mar 17 | Jun 2–Jun 9 | 121 | fits: 90 days to maturity, 121 available after Jun 2. | — |
| Calendula | Apr 14 | May 12–May 26 | 128 | two-plantings: Plant May 12 and again by Jul 15; both mature before Sep 17. | Jul 15 |
| Cosmos | Apr 28 | May 26–Jun 9 | 93 | fits: 60 days to maturity, 93 available after May 26. | Jun 14 |
| Lavender | Mar 3 | May 26–Jun 9 | 128 | fits: 90 days to maturity, 128 available after May 26. | — |
| Marigolds | Apr 14 | May 26–Jun 2 | 93 | fits: 50 days to maturity, 93 available after May 26. | Jun 24 |
| Melons | May 12 | Jun 9–Jun 16 | 65 | head-start: Even planted out Jun 9, the outdoor season is about 20 days short; choose an early variety or grow under cover. | — |
| Mint | — | May 26–Jun 9 | 128 | fits: 90 days to maturity, 128 available after May 26. | — |
| Nasturtiums | Apr 28 | May 26–Jun 2 | 93 | fits: 55 days to maturity, 93 available after May 26. | Jun 19 |
| Pole Beans | — | Jun 2–Jun 16 | 86 | fits: 65 days to maturity, 86 available after Jun 2. | Jun 9 |
| Spaghetti Squash | May 12 | Jun 9–Jun 16 | 72 | head-start: Even planted out Jun 9, the outdoor season is about 18 days short; choose an early variety or grow under cover. | — |
| Sunflowers | — | May 26–Jun 9 | 93 | fits: 70 days to maturity, 93 available after May 26. | Jun 4 |
| Tomatillos | Mar 31 | Jun 2–Jun 9 | 72 | head-start: Even planted out Jun 2, the outdoor season is about 3 days short; choose an early variety or grow under cover. | — |
| Watermelon | May 12 | Jun 2–Jun 9 | 72 | head-start: Even planted out Jun 2, the outdoor season is about 8 days short; choose an early variety or grow under cover. | — |
| Yellow Squash | May 12 | Jun 9–Jun 16 | 79 | fits: 55 days to maturity, 79 available after Jun 9. | Jun 19 |
| Zinnias | Apr 28 | May 26–Jun 9 | 93 | fits: 60 days to maturity, 93 available after May 26. | Jun 14 |
Month by month in Anchorage
| 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 | Start indoors: Chives (Mar 3), Lavender (Mar 3), Onion (Mar 3), Rosemary (Mar 3), Celery (Mar 17), Collards (Mar 17), +12 more. Direct sow from: Arugula (Mar 31), Beets (Mar 31), Dill (Mar 31), Peas (Mar 31), Radish (Mar 31), Spinach (Mar 31). |
| April | Start indoors: Eggplant (Apr 7), Calendula (Apr 14), Cauliflower (Apr 14), Marigolds (Apr 14), Pepper (Apr 14), Basil (Apr 21), +7 more. Direct sow from: Kohlrabi (Apr 14), Cilantro (Apr 28), Turnip (Apr 28). Transplant from: Broccoli (Apr 28), Brussel Sprouts (Apr 28), Cabbage (Apr 28), Collards (Apr 28), Kale (Apr 28), Lettuce (Apr 28), +2 more. Plant: Strawberry (Apr 21). |
| May | Start indoors: Cucumber (May 5), Butternut Squash (May 12), Cantaloupe (May 12), Melons (May 12), Pumpkin (May 12), Spaghetti Squash (May 12), +3 more. Direct sow from: Carrots (May 5), Potatoes (May 12), Sunflowers (May 26). Transplant from: Calendula (May 12), Swiss Chard (May 12), Bok Choy (May 19), Cauliflower (May 19), Cosmos (May 26), Lavender (May 26), +4 more. Last frost around May 26. |
| June | Direct sow from: Beans (Jun 2), Pole Beans (Jun 2). Transplant from: Celery (Jun 2), Chives (Jun 2), Corn (Jun 2), Okra (Jun 2), Oregano (Jun 2), Parsley (Jun 2), +17 more. Last sowing dates: Sunflowers (Jun 4), Brussel Sprouts (Jun 9), Pole Beans (Jun 9), Cosmos (Jun 14), Cucumber (Jun 14), Zinnias (Jun 14), +10 more. |
| July | Last sowing dates: Cabbage (Jul 9), Carrots (Jul 9), Beets (Jul 10), Dill (Jul 10), Swiss Chard (Jul 10), Calendula (Jul 15), +8 more. |
| August | Last sowing dates: Arugula (Aug 8), Spinach (Aug 8), Radish (Aug 9). |
| September | Direct sow from: Garlic (Sep 10). First frost around September 10. |
| October | Last sowing dates: Garlic (Oct 1). |
| 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 Anchorage, AK (ZIP 99507)?
The median last spring frost date for Anchorage, AK (ZIP code 99507) is around May 26. 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 May 10; one in ten it runs past June 10.
What is the first fall frost date in Anchorage, AK?
The median first fall frost date for Anchorage, AK is around September 10. 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 24 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Anchorage, AK?
The frost-free growing season in Anchorage is about 107 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 Anchorage (107 frost-free days, a short season), 29 of 56 planner crops fit outright, 15 get two plantings, 9 need an indoor start, 2 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Anchorage, AK?
Anchorage, AK is in USDA hardiness zone 5a (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 Anchorage, AK?
Start tomatoes indoors Apr 21 and plant out Jun 9 in Anchorage. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Anchorage?
Two: plant Apr 28 and again by Jul 20; both mature before Sep 17.
When do I plant garlic in Anchorage?
Sep 10 to Oct 1; it overwinters and is ready the following summer.
Can I grow Celery in Anchorage?
Yes, with help. Even planted out Jun 2, the outdoor season is about 13 days short; choose an early variety or grow under cover.
Which nearby ZIP has a longer season?
Eagle River (ZIP 99577) has 117 frost-free days, 10 more than Anchorage (ZIP 99507). See Eagle River ZIP 99577 frost dates
Nearby and related
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- Frost dates for Eagle River, AK 99577 (13.7 mi)
- Frost dates for Wasilla, AK 99623 (21.7 mi)
- When to plant in Anchorage, AK: month-by-month guide
- When to plant in AK
- When to plant Beans in AK
- When to plant Strawberries in AK
- When to plant Beets in AK
- When to plant Broccoli in AK
- When to plant Carrots in AK
- When to plant Kale in AK
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